Taboo (1988)

Story of a tragic love triangle that develops between a mother daugther and a farmhand. A good-looking widow lives alone on a farm with her teenage daughter. Their neighbor occasionally helps them in the farmwork. He would have eventually married the mother, but the daughter tries to seduce him at all costs. He becomes the lover of both women, but eventually runs away leaving the mother shattered and the daughter pregnant.

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