Universal rules never change. House rules can vary from house to house, from town to town.
House rules are important. They will be part of what makes your family different, what defines its culture, and what helps form a legacy.
But remember to never conflate house rules with universal rules. Equating them does not elevate your house rules. It only lessens the universal rules in the eyes of your children. It drags them down.
House Rules vs. Universal Rules