What made Joseph decide to take his family to Egypt?
An angel appeared to him in a dream and told him to.The angel of the Lord appeareth to Joseph in a dream, saying, Arise, and take the young child and his mother,
and flee into Egypt, and be thou there until I bring thee word: for Herod will seek the young child to destroy him.
Matthew 2:13 http://www.thebricktestament.com/the_gospels/jesus_is_born_02/mt02_13.jpg
