Cadavres (2009)

Raymond is a jealous, misanthropic, couch potato. Angèle is a sexy TV star, childish and disillusioned. One Halloween, their mother, Solange, suddenly dies. Raymond calls his sister for the first time in 10 years. She agrees to meet him and begins to investigate their mother's death, all in keeping with her TV role of police commissioner. But nothing is simple with the Marchildons. Between a dithering Raymond, the ghost of Solange who continues to haunt her children, and Angèle who's going crazy interviewing suspects, one more bizarre than the next, and the bodies that are filling up the basement, it's hard to keep their love straight. But then, love was always a little twisted in the Marchildon household.

Unfortunately the movie Cadavres is not yet available on HBO Max.