The basic theme of the movie is that a husband is cheating on his wife and when his daughters suspect him they wonder if they should tell their mother.
The actual story is much less about the husband and the wife, or even about what the daughters are doing about the affair. To me, that part of the story wasn’t done very well. What I did like though was the interaction between the two sisters.
The movie is set in the ’90s but I’m not sure why. There was nothing in the story that necessitated going back that far in time. There were no cell phones in the film but the landline telephone really didn’t play any part in the story.