I was watching a movie on Russian Television Network of America and am trying to find it. What I can remember about it is that I think it is Soviet era and that there is this scene where on the way to the country side the family stops to bathe in a river. The girl goes in and the mother goes in to help and the boy goes into the woods. When he doesn't return the parents go to find him leaving the girl by the river bank. They find him and continue. After the kids are a sleep in the car the parents go bathe in the river.