She teaches her children her perception that rules are different for her and her family when they live in a foreign country. She says it's best to learn the rules as they apply where you live.
She then makes her own rule for chess (winning is about who keeps the most chessmen on the board) in a game she does not play herself. If she took her own advice, she'd learn the actual chess rules.
One main reason was because he was such a respectful figure. John Adams would have written it but when the delegates were deciding who should write it, they picked Jefferson because he excelled over Adams in writing.
