House Rules

There's a card game I always wanted to play but never got a chance to until now — John Eternal's Donsol. The rules are simple yet open to interpretation. While playing it with family, there were multiple times where we asked, “Can I do this?” After much debate we decided upon new rules.

I am fascinated by this inflection point where a game goes from a received rule set to a personal one. When do house rules take hold? Are there instances where the received rule set is merely a personal rule set passed down to others?