Some Girls (1988) on Netflix

Michael, a college student, visits his girlfriend Gabriella and her family for Christmas in Canada. When he gets there, she tells him that she doesn't love him any more. Meanwhile, her family is exceedingly strange: her father is a writer who spends most of his time wandering the house nude. Her grandmother mistakes Michael for her dead husband. Her two sisters express interest in him. Granny escapes the hospital and heads back to her home in the woods, and the family chases after her, and Michael is kept reeling.