Can you force child play therapy on a family member or must a parent?

Play therapy. To clarify: child play therapy is a way for children to express their experiences, feelings through a natural self guided, self healing process. Play therapy enables communication/assistance to overcome psychosocial challenges. No one can every "force" a child to do something without backlash. Forming a strong alliance (parent/md) and engaging your child will be the key to moving toward any goal.