Something About Amelia (1984)

Shame and fear have kept Amelia Bennett silent about the sexual molestation she's been suffering at the hands of her father, Steven. But as Amelia starts to believe that Steven might harm her younger sibling in similar ways, she unburdens herself of her awful secret. Confronted with this horrifying piece of news, Steven's wife Gail can't believe it's true, and he professes his innocence. But as new details emerge, the family is shaken to its core.