Can illegal immigrant mom sue illegal resident father for child support?

i doubt it. as she is illegal, there's no record of her being in the country. thus, she doesn't exist in the country and she cant go to court without someone else papers or a fake identification.

Actually, child support does not request evidence of being here legally to open a case. They get 15% in federal matching funds on all child support paid. In this economy, they are not going to pass up every possible case to open.