Does anyone remember a movie about the end of the world, I thought tom hanks played in it, I might be wrong, its about a family who thinks the world is coming to a end. So the father builds a house underground and lives there for 30 yrs thinking a nuclear bomb destroyed the earth, to find out that 30 years later that it was a plaine that crashed into their yard

Think you're looking for this:
Blast from the Past (1999) - IMDb (http://www.imdb.com/title/tt0124298/)
http://en.wikipedia.org/wiki/Blast_from_the_Past_(film)