It was a movie about two sisters. They were taken away from mom when young. One sister goes to a good rich family and the other goes to a poorer family when they meet each other they end up killing their step father and they go to jail. I think the sisters name was April and may or something their mom used to say to them April showers brings may flowers.

Cellblock Sisters: Banished Behind Bars (1995) (http://www.imdb.com/title/tt0112649/reference)