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[Curious Diode]

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[Pajarita]

Geez, are there still breeders that do the unilateral clip?! I thought that had gone the way of the dinosaurs! NOBODY does that clip anymore, it's highly dangerous to the bird so I am afraid that you cannot wait until molt to decide anything, you need to have the other wing clip or he will end up hurting himself.

Also, is this a baby? Because the fluttering of the wings you describe is what babies do when they are hungry so, if this is a baby, that's why he is doing this: the poor baby is not getting enough food. Breeders always tell you the bird is weaned but this doesn't mean that you can put bird food there and leave it at that because babies cannot eat grown-up food, same as toddlers don't eat adult food. He needs soft food served fresh twice a day as well as a big piece of fruit, a smaller veggie and a good quality budgie seed mix (the food you mentioned is full of artificial colorings and flavorings, not good for any parrot!). And, please, don't disregard this advice because a baby that doesn't get enough to eat will develop an eating disorder when adult.

As to poop, I use an old dish towel that I keep wet when the birds are out. It's cheaper than using paper towels -which, I hardly ever use for anything as I am very environmentally conscious and hate killing trees for paper.

As to the relationship... I am afraid that we don't choose the bird, the bird chooses us and it seems that he chose your mother as his human. But this doesn't meant that he cannot have a good relationship with you as long as you respect his wishes and are very patient about it. Besides, if he is a baby, you are better off if he likes your mother better now because, when they grow up and become sexually mature, they no longer prefer the human that took up the 'mother' role and usually 'replace' him/her with another human - which could very well be you!

[Wolf]

How old is your GCC? I think that most people get their birds at such a young age that it would be best to fix any issue with the way that they have been clipped as soon as possible, but if your bird is older than the usual bird it is possible that he is about to molt so I would not mess with any of the feathers on the side that was clipped, but I think that I would still even then on the other wing so that he can regain some control over his flight.
The behavior that you describe may be incomplete or not as it does not include the position of his bodily contour feathers nor what he is doing with his beak. Again his age could make a difference as well. This could be that he is claiming whatever he is on as his or it could be asking for food or attention. A video would be helpful to see what he is doing.
I keep a roll of toilet paper on hand and some rolled up in a pocket for emergencies. I don't use paper towels as the toilet paper is much smaller and cheaper. Paper towels are too large and thick, they are like overkill for a little poop. Now since you bring it up I do not recommend potty training a bird for any reason. Please read this as well as the link contained in it, viewtopic.php?f=8&t=13918
In regards to your birds behavior with your mom, It appears that he may have chosen her as his favorite human and this also suggests to me that he is older than the baby bird that most people usually get. If you find that who he is most bonded with to be a problem then you would have to keep him and your mom away from each other, watch while he goes into depression while you do all that you can to encourage him to rebond with you and maybe he will rebond with you after he has finished grieving the loss of your mom, but then as soon as he sees her again he is very likely to choose her once again. Still working on building his trust in you and your relationship with you as being his second favorite person is a good thing to do and may very well eliminate his poor behavior towards you over time.
There are several reasons that I am perhaps not the best person to reply on this issue of pellets as I do not like them and do not feed them to any of my birds. Instead I feed fresh raw fruits and vegetables and gloop for their breakfast as well as for all day long and a quality seed mix for their dinner.
Toys are a rather humorous issue in many regards and I do supply my birds with things to use and destroy as toys. Birds in their natural setting do not have toys but they do practice on their foraging techniques and they do practice their self defence, well some of them do, but no toys. I supply my birds with a variety of toys for foraging and some just for them to destroy, but the thing with toys is that they tend to be afraid of them at first and then you must teach them what they are as well as how to use them. This is accomplished by playing with these toys yourself. If the toy can be taken apart, then sit in front of him and take it apart and put it back together over and over until he demands to play with it himself. This holds true regardless of the toy type that you choose for them, play with it with them watching until they want it enough to try to take it from you.

[Curious Diode]

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[Curious Diode]

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[Wolf]

That is very similar to the body language that Kiki, Senegal uses when she claims something as hers and will bite to defend it.
Given the age of your bird, I would think that he has recently gone through puberty and his new attitude towards yourself and mom are the result of this change. When we get parrots as babies or at anytime prior to puberty we are taking on the role of their parent(s) as that is the nature of their bonding with us at this time. It is actually not the bond that we are looking for in our birds, that only develops when the bird achieves maturity after going through puberty, this is the long lasting mate bond. This change in their mental processes and personality accounts for the reason for so many parrots being rehomed or being placed in rescues. It is because the owner of the bird did not realize that this is the normal course of events and that if they were the parent to their bird that it would choose another person to bond with upon maturity if one is available and they don't want to be the second choice.
If you will be patient then as long as you continue to care for your bird as well as continuing to build a good trusting relationship with him he will accept you as his second favorite person and will respond to you as if you were his favorite when your mom is not around, but it will take some time and work to achieve this and it can be just as rewarding as being his first.
There is also the possibility of this changing, especially if your mom does nothing to encourage him to remain bonded to her. When Kiki first came to live here, she was also going through puberty, although I did not know it at the time. She was our first experience with a parrot and she chose my Lady right away as her favored human and wanted nothing to do with me and we just accepted this as the way that she was. I was the person that took care of her and all that I received for my efforts was a lot of very hard bites. As time passed and I studied to learn more about this strange bird that had arrived in our lives and demanded to be let in she changed her mind and decided to bond with me instead of with my Lady and has remained bonded with me since that time almost 4 years ago. So do not give up on him as he may still choose you as his special human. My Lady just did not have the time to devote to Kiki as she works full time and is usually stressed as well as tired when she gets home, while I am always present for her due to being disabled and no longer able to function in the normal working environment. So if it is possible to limit the time and attention that your bird receives from your mom then you still have a chance that he will bond with you so you really need to keep working on learning to read his body language, earning his trust and building a strong relationship with him. The time that was involved from the time Kiki came here until when she finally chose to accept me and bonded with me as her preferred human was close to a year, so it does take time.

[Pajarita]

Does he open up his wings just a little bit while keeping them curved and lowers his head a bit putting his body the tiniest bit forward in the process of fluttering his wings fast? Because, if that is what he is doing, he is doing what I call 'the pretty please', something that babies do when they are hungry and adults do to ask for attention.

Now, if he is 2, he is already sexually mature and, if he has chosen your mother then that is the human he has chosen BUT, in my personal experience, a GCC that is not hormonal (light schedule and diet) and has lots and lots of one-on-one attention (and that means perching on a human for hours, mind you!) is so sweet-tempered that would go to practically anybody who is familiar to him so keep on working on getting his trust and love and you will get it.

[Curious Diode]

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[Wolf]

Unless you know what you are doing, I would take the bird to the vet and have them clip the wings even. There are many places that do not clip the wings properly and that causes problems for the bird. Have it done properly and then let them molt so that he regains full flight.
Pajarita has GCC's and I do not so she would be more accurate in what his body language is.

[Pajarita]

The problem with this type of clip is that it doesn't allow the bird any control over its body nor provides equal exercise to both wings - both bad things! I don't believe there is any good reason for clipping a bird except a medical one but, if you are going to clip, at least give the bird a decent clip. I have a bird that has only half a wing so, in order for him to have equal control over both sides of his body, I clip his other wing short. This way, if he is falling down and he flaps his wings, he will fall on his feet and not on his side as he would if he had only one good wing.

Molt is ALWAYS symmetrical so if he loses two feathers on one wing, he will lose the same two feathers on the other one - ergo, clipping the 'good' wing is not going to affect his molt.