Yikes! Poor fish. Well thats one fish less and now it would be easy on you as you have only one channel catfish left which its no problem....if he survived from your sister lol.
Yeah i been there, my mom always hates natives, she thought they werent so attractive compared to the tropical fishes. She once flushed all tadpoles and natives down when i was 9 years old and i was so upset! Now I have my own tanks, instead of family tank. Trust me, I better listen to the mother, you have no chance against the mothers.