Umm ok, lets see if this works, have your mom with no humans around, then while she eats, whole wheat, eggs, rice, even popcorn (no salt or butter) have your family feather buddy sit near her on the table, with an extra plate of food, same as your mom.
remember this very important, we think as human time, you have to understand parrot time can be longer, they don't understand human time.
,she can try baby food with a spoon make it just like she did, keep the temp the same as she was handfeeding him.
what happens when your family buddy sits on your mother shoulder? I mean don't pet him, just talk to him just a little bit and while she does stuff around the house, just let him get used to hanging around on moms shoulder.
another thing that might help when your mom is in her bedroom, have the baby, with her and get a box of toys, put the box close to your mom, (baby toys are safe and you can get them at a thrift store, just clean them very good) let the baby play by his self, he might want to show mommy his toys then she can play but not to much, then at this time, play peck a boo using a cover to cover mom eyes, it might take time but they love it.
show me your wings game, just have the baby in your finger, and say show me your wings, while moving your hand up and down, then praise him everytime he lifts his wings.one day he do this with just saying show me your wings
good luck I really hope this work
Ask if you need more help,