7th Heaven was about family and friends and day to day life problems they faced. Even though I thought the idea of bringing in the twins Sam & Dave didn't go over too well, the rest of the show was fine.
Mary and Simon the two "rebel" children in the family were always welcomed back with open arms once they realized their family would always be there for them.
The Camdens' open door policy to everyone in the community was a nice idea, though in this day and time most people wouldn't be ike in reality.
I love the fact that when it was time for Lucy to move out, finally, she bought the house behind her.