Would love to make my brother's life feel a bit normal

My brother recently found out he has Crohns disease and it's been really difficult for him with changing his diet and the back pain.

My son has his second birthday coming up and I would like to give him something he can eat.

My mom has tried to make something with tapioca flour but the consistency of it is terrible.

Just looking for any ideas on something we could make him when everyone is having cake.

Thanks so much in advance🌻