Welcome to the forum, Skipper (I hope this was his old name because changing it upsets them) and new family!
Senegals ARE quiet parrots but it's only relative to other parrots and not to what we, humans, consider 'quiet'. And, yes, there are some that scream all day long but they only do it when they are unhappy so, please, tell us a bit about him. What are you feeding him? What is his light schedule? How many hours of one-on-one and how many of out-of-cage (this is the main reason why they scream when they are young)? Where is his cage located? Is it a good size?
Now, PLEASE do not allow your son to handle the bird! Let me explain. All parrots are one-person birds but, although they all have the trait, companion species have it to a greater degree (hence the 'companion' attached to these species) and senegals, in particular, are the ultimate one-person birds - they NEVER work out as family pets because they bond VERY deeply with their chosen one. Which brings another issue, it's the parrot who decides who is going to be 'his' human. Now, this does not mean that a senegal cannot work out in a family environment. It can. It's only that it will require its human to spend a lot of hours with it (to keep it happy and satisfied) and the other family members will not be able to really interact a lot with it. My female senegal, Zoey, loved me from the first time she saw me and hated my husband with a passion. This was the same behavior that got her rehomed in the first place: she loved her human and HATED his wife. They tried everything they could think of but, after years of this, the wife gave the husband an ultimatum, it was her or the bird -the wife won and I flew to California to pick her up. Here, the whole thing continued for a couple of years but, eventually, she calmed down (she has a senegal male boyfriend, too) and she is now OK with my husband. She flies to his shoulder without biting his neck or face and allows him to carry her from one place to another on a stick (she can fly very well but she won't go into her cage on her own).
So, although there is hope that your bird will get to regard you and your son as flock-mates, the thing with male senegals is that they are HIGHLY aggressive and, for all their small size, have POWERFUL bites (and I have the scars to prove it!). Sweetpea, the 'boyfriend' male senegal, is the ONLY bird that I have ever been afraid of to the point that I dreaded going into the birdroom because he would relentlessly attacked me several times a day every single day for 3.5 years. So, please, do not let your son interact physically with him because he can end up hurt. Your senegal is now in what we call 'the honeymoon' stage which is when they are at their very best behavior and when even aggressive birds don't bite but yours is already biting (or is he just nipping?). To put the icing on the cake, he is also at a very difficult age because he is going through bird puberty and as soon as the days start getting shorter (they are short day breeders) he will produce sexual hormones which translates into aggression no matter how tame and loving the bird is. So, please, spend as many hours as you can with him, let him out of his cage to fly, talk, sing, whistle to him, offer him a treat (but be careful not to feed too much protein because that makes them aggressive, too) every now and then and, if you have to move him, use a stick, do not offer your hand because they do the 'come into my parlor trick': they look all innocent and sweet and put out their foot as if to step up and BAM! bite HARD and don't let go (they are like little pitbulls! I've had Sweetpea hanging from my right eyebrow, with blood running dowm my face and me pulling with both my hands his body away from me and he would NOT let go).
Now, not responding to his screams is not going to make him stop. If this very commonly recommended trick worked, cockatoos would not end up in rescues in droves because of their constant screaming. Parrots don't scream just because, they do it for the same reason a baby that woke up alone in a room does: they need company. And, to them, company does not mean you in the same house and him in a cage. It means riding the shoulder of its chosen human or perching on some part of his body (Zoey is perching on my right knee right now) so I am thinking that, when he is screaming, he is locked in his cage - is this correct? If so, does he stop when he is allowed to come out? Does he do it all day long or only at dawn and dusk? Does he do it when he is with your husband? (I doubt it). Do not make the mistake of not allowing him shoulder time. We have a member that bought a baby and decided, based on some stupid advice he got on the internet, not to allow her on his shoulder but, by the time she was almost two, the bird screamed all day long non-stop. Once he allowed her shoulder time, she stopped. It's as simple as that. They need what they need and they will NOT adjust to what is convenient to us, we need to adjust to them. Have you ever heard the expression: "If momma ain't happy, there ain't nobody happy!"? Well, change momma for birdie and you got it!
And that's why it's so hard to keep them happy and healthy and why almost all of them end up rehomed, because their needs are always in a collision course with the lifestyle of a normal family. So I strongly suggest that you plan the right husbandry now from the very beginning so the bird doesn't get used to screaming and biting which will be harder to correct later on. The honeymoon is the foundation of your future long-term relationship with the bird so do it right and you will have a companion for many, many happy years.