Please help me name this movie

I’ve been trying to find this movie since I was a kid. It a 1980s or even a 1970s movie or made for tv movie movie. It’s about a family. I’d say a poor mountain family that live in a rural poor community. They live in a cabin. The man is from Boston and his parents die. He builds a Mainson for his wife. He tells her that it’s not finished and it needs curtains and paint. She goes to the fireplace and removes a stone and there is a large pile of money there. He also furnishes the house with furniture of his parents. His sister also comes to live in the new house and the ending scene is her telling the children not to slide down the banister.