- HD 1080
- Runtime: 100m.
- Status: Released
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- Languages: fr
- Country: Canada, France
- Director: Claude Chabrol
- Stars: Donald Sutherland, Aude Landry, Lisa Langlois, Laurent Malet, Walter Massey
- keywords: canada, based on novel or book, diary, relatives, montreal, canada, murder, investigator, incest
- Production_studio: Classic Film Industries, Cinévidéo, Filmel
- Slogan: The Most Intimate Act Of All Is... ...Murder!
- The Blood Relatives is featured in the top rankings of 1978
- #30 in Top Crime Movies of 1978
- #41 in Top Thriller Movies of 1978
- #24 in Top Mystery Movies of 1978
A Montreal police inspector cracks a murder case with clues from the victim's diary.