Before watching the movie:
So a young couple makes a real estate investment to live their dream, and then everything that could possibly go wrong with that choice does. That sounds a lot like The Long, Long Trailer to me. Only this time it’s Tom Hanks and Shelley Long, and the house doesn’t roll. (Probably.)
Unlike that movie, a lot of the problems turn out to be disastrous unexpected costs, rather than just ruining their marriage, which probably happens too, because money is the top reason couples fight.