The leaders of the LDS Church have for MANY years asked families to set aside one night a week as Family Home Evening -- of Family Night. For most this is on Monday night. With Matt's work schedule and such we don't always have this on Monday's - nor do we usually have a lesson and such like I think we are really supposed to. I have always had a hard time trying to come up with a lesson that is geared towards my little ones. I usually at least try to read them a story from The Friend magazine.
I came across this website both through PYP and from an email from a friend. They have get lessons based upon the Primary Theme for 2009.
No matter what religion you are or what you believe - I sincerely feel that it is important to set aside time each week as family time.