Riding in a 'balloon chair'?
If I am not mistaken, this movie had a scene where one of the sons goes floating off in a patio chair tied to weather balloons?
(If it is, I saw this film at the drive-in when I was only ten or so years old. The memory is still there because the film that played after was Dr. Strangelove and it made a strong impression on me even at that young age. My folks weren't impressed with Dr. S and only stayed because I insisted. Thanks mom and dad.)