The bigger issue than simply filing for a RO/PO would be if the judge granted it. The order could have a bearing on custodial matters depending upon the reasons for the order being granted, such as threatened violence or a history of previous physical abuse, etc.
Her mother
that depends on if the mother has custody over her daughter or not. It also depends on how old the daughter is. If she is under the legal age limit, then the mother is still responsible and makes all decisions for her. If the mother does not have full custody over the daughter, then the mother and the father of that child must come to an agreement on the living whereabouts of the daughter. If the mother has legal custody over the daughter and the daughter is not of legal age yet, then yes, the mother can bring the daughter over too.
For 1) are you in custody of your daughter? If you are in full custody you could take her to court for kidnapping is your EX mother in law in custody of your daughter? Do you have joint custody? If your ex mother in law has no custody over your daughter you could take her to court, she is not authorized to take care of your child.
Preparesee links
you get it for her.
if she's the biological mother
By proving it in the child courts.
O9nly if he has primary custody, or family is intact.
You must file for legal custody of the child. If the judge sees the mother unfit then custody battle will most likely be won.
Assuming Dad has custody, then he would have to agree to let daughter move in with you OR you would have to petition the court for a change of custody.
The mother should file for sole custody before attempting such a move and even if it is granted, permission should be obtained from the court beforehand. Otherwise, the mother could find herself in the midst of a protracted and expensive custody battle.
YES, IF SHE HAS SOLE CUSTODY OF THE CHILD AND THERE WAS NO AGREEMENT TO STAY IN THAT STATE. OR IF NEITHER PARENT HAS LEGAL CUSTODY EITHER PARENT COULD DO THAT