Like Mother Like Daughter (1972)

A kinky mother and daughter are having lots of fun living together with Mom’s second husband. As a family, they live by the rule that the family that stays together does everything together. But when Mom’s first husband returns from a long trip and finds out about what’s going on on the home front, he blows a fuse and tries to prevent his daughter and her mother from continuing to live with the swinging step-dad. Not wanting to disrupt a good thing the daughter talks a girlfriend(who she has the HOTS for) into a little Trick against her Dad,who does not know what she looks like as an Adult. The girls leave Dad High & Dry and upon understanding the ruse Daddy dearest decides not to try to gain custody after all they really are Like Mother, Like Daughter