How can I gain custody of a child that is not biologically mine although I am a relative?
Question Details: Would I need consent from both parents even if I thought it was in the best interest of the child?
The only way that you can achieve custody of a minor child that is not yours is via a custody stipulation by the child's parents subject to a court order giving such custody to you. I suggest that you consult with a family law attorney as to how to proceed if such is your and the parents' intent.