Answer: Permissive
Step-by-step explanation:
Permissive parenting style is the type of parenting method in which low demands persist with high responsiveness.In this mechanism, parents provide affection, openness and love to children in form of friend along with certain regulation that should be followed by child.
According to the question, Frank's parent have permissive style of parenting because they do no have any strict rules for Frank rather give him openness to perform activities as he likes. Thus, they have friendly and affectionate parenting style.