I've been raising my ex-husbands daughter since birth and now he wants her back he lives in CA. Can i file for custody i had her since birth. She's 9y

The first question is "jurisdiction."  Frankly, it is hard to tell who is who, or related to whom, biologically or otherwise, from that recital.  It is unclear whether any court anywhere has ever issued a custodial order.  if not, then it appears that Nevada is the child's Home State, and therefore the place where any case would proceed.  If there is some prior order somewhere else, however, it is possible that any case would have to be prosecuted there. If you have raised this child since birth, then there is a chance for either a guardianship or a custody order naming you to care for the child.  Those topics are explained here and here.  It also appears to be that the birth certificate is knowingly false, naming at least a father who is not actually the father; where the biological father fits in is unclear.  It is possible that those facts would support a Termination of Parental Rights to get the brother/uncle out of the picture; explained here. In any event, after reading those pages, you should consult with a family law specialist, because it is clear that the situation is a mess, legally and otherwise, and the people involved are volatile; both you and the child deserve some stability, and tht is only likely to happen if you get qualified counsel to unwind the mess and establish proper orders.