Movie from the 80’s (I think). It was a murder mystery

I saw this movie when I was fairly young. All I remember is the older cousin ends up stabbed to death in an alley and at the end it’s revealed that the younger cousin sees the older cousin kissing someone so the young cousin stabs the older cousin to death. This has been driving me crazy for years. The ending disturbed me so much that here I am 30 years later still thinking about it.

3 thoughts on “Movie from the 80’s (I think). It was a murder mystery

    1. Mr. Unknown, thank you, thank you, thank you!!!! Blood Relatives!! That’s it!!! This has seriously been driving me CRAZY for YEARS!!! You’re my hero!!!

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