What do you have a gentleman's agreement about?

Whether a cream tea should include a scone with jam first or cream first.

The correct answer is jam.

My sisters and I have 2:

Whoever invites the others out to dinner also pays for everyones food and beverage

Whenever one goes on a vacation the others shall recieve a cheap and ugly travel gift upon the return. (Maximum 10 euros)

That there are no gentlemen