It is rude to charge family for small things.
Sally's sister was sick with the flu and could not cook or get to the store.
Sally wants to get some dinner to her sister to be sure she gets well.
Sally leaves the soup for sister and wishes tell her to get well.
Sally asks her sister for $5.75 to cover the cost of the soup.
Sally's sister feels loved and enjoys her soup that night.
Sally's sister is irritated by Sally's request, and she doesn't even have any cash on hand to give Sally.