From what little I remember of the movie and book, there was essentially a pair of brothers (one short and fat, the other taller and leaner) whose house gets transported to space (somehow.) They survive until an astronaut comes and saves them.
In the movie adaption, there was also an older sister who gets frozen at one point, and the brothers thaw her with a hairdryer or a lighter (using a blowtorch was shot down, as the younger brother kindly states that "You're gonna cook her." )
I distinctly remember a scene from the book where the fatter brother was, for whatever reason, expanding sideways and shrinking down, so the other brother had to do something to stop it.
They also might have had something to do with a board game (little brother was holding a board game while he was bloating, or maybe playing a board game during that time.)