Keep It in the Family (French: Les Cocus) is a 1973 Canadian sex comedy film starring John Gavin, Patricia Gage, Adrienne La Russa and directed by Larry Kent.
A young couple, Karen Sayers and Alex McDonald (Adrienne La Russa and Alan McRae), are fed up with the disorganized grime of student ghetto living and decide they are ready for their own apartment.
Alex wants to call off the deception, but Karen finds herself falling in love with Roy and so she spends her time wining, dining and sneaking back to the student quarter in the wee hours of the morning.
However, he is too exhausted by her rugged schedule of tennis, golf, swimming and jogging to absorb the good news that her condition was a false alarm.
The wedding plans proceed smoothly until Roy brings Alex to the Sayers' house and Celia realizes that her ex-gardener is her future son-in-law's son!