Any info please

. I have been raising my niece. She isn’t really she think she is. For 3 years now with no help from her father ( he has full custody legally. Mother has no rights) he doesn’t help ever and I just found out he was getting food stamps and cash add for her for the past three years and not helping me at all. But welfare kicked him off I guess they told him they found she wasn’t living with him. So can I request aid for her too? But he won’t give any any kind of guarding ship or anything. Idk what to do! I also live in California if that matters. Thank you.