my daughter needs to go to rehab, what do I need to do to get temporary custody of my granddaughter? Her biological father has visitation rights for every other weekend but her and my daughter have always lived with me,and she has always went to this school,she would be devastated if she has to go live with her father nor would my daughter go to rehab if she couldn't stay with me. I don't think her father will sign papers. Does he have to or can my daughter just sign her over to me? Do I need a lawyer?