My Bird Is Fat But My Parents Say Otherwise

I can't take any photos right now, but..

I'm 14, and live with my parents. I refilled a large, half- foot high, less- than- a- foot wide container, and my blue budgie managed to eat it within 2 days, with little help from my yellow budgie. My blue budgie seems fat, because you can't see his keel- and can't run well, but my mother says otherwise. She always spoils our pets. Every pet we get ourselves and want to take care of ourselves, she always spoils them much more. When I told her that he was fat, she ignored that and yelled at me for "not refilling the food". Usually I refill it within 3-4 days (and I was planning on refilling it with a mix of pellets later), but she ignored my claims of protest telling her about what happened. I told her that he was fat, and her response was "don't be ridiculous". She refilled the entire thing with seeds only and let them eat almost all of the seeds. I don't know what to do, because I know that he's fat and my yellow budgie will starve if he and my mother continue this. Any help?

Edited September 15, 20204 yr by Fyodirr
Correction.