I believe your bird will be fine too. He already knows your mother and surroundings, conures are sociable and with you not being there he will probably start demanding cuddles from her lol.
You have already got him used to being without you as janetafloat says albeit for shorter periods of time.
The type of birds that usually can't cope with their owners absence are birds that are never left alone and then suddenly they owner doesn't come back for a while, ones that are not accustomed to change or those with a more sensitive nature that bond very deeply.
I'm not saying he won't be sulking a bit when you get back though!!





