Sibling Rivalry (1990) is a Comedy, Romance film that follows marjorie Turner is suffocating in her marriage and day to day life. An extramarital affair with a stranger seems to be the answer until her paramour has a fatal heart attack, and turns out to be less of a stranger than she could have thought... Sibling Rivalry is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 5.2 out of 10 from 60 votes. Fans of comedy movies may also want to explore similar titles below.