My husbands bad for this, he has gotten better lately. I dont think it is good for him. He has made it to 51, is it worth arguing w/your mother? Sugars are bad, fats in our food are too much for them.
Maybe you can start offering better choices, fruits, veggies independant of your mom. Be consistant, offer them @ the time of the day that he seems to eat the most, every day. Vary the choices, try raw, cooked, whole & diced up. Try to find out how he likes it. Make skewers & hang on the cage, make it appealing to his little parrot brain.
I know my husband & I have had bitter arguments about this, he seems to be somewhat reformed (or he doesnt do it in front of me).
Maybe instead of divorce I can run a CL ad, "for rehoming, 1 used husband, hard worker but unrepented spoiler of children & pets, price negotiable"