From an 8 year old's perspective (an excerpt taken from an essay on God handed in at school):

...Jesus is God's Son. He used to do all the hard work like walking on water and performing miracles and people finally got tired of Him preaching to them and they crucified Him.
But He was good and kind, like His Father and He told His Father that they didn't know what they were doing and to forgive them and God said "O.K."

His Dad (God) appreciated everything that He had done and all His hard work on earth so He told Him He didn't have to go out on the road anymore. He could stay in heaven. So He did...