This television movie is surely from the 1980s and I’ve watched it a couple times on Lifetime. The father has an incestuous relationship with his daughter.  I remember a scene where the girl mentioned previously is at the mall with her little sister and asking if their father has shown increased interest in her. Also another scene, when she returns from Christmas shopping, the father rapes her under the Christmas tree. Later, she tells her boyfriend about everything and they agree to kill him. I believe he was shot in his front yard…  The girl mentioned has brown hair and a pronounced overbite. That is all I can remember…