Family are expected to help each other with their problems.
William's sister needs a ride to her soccer practice and asks William for a ride.
William wants to respond to his sister.
William obliges his sister's request and drives her to her soccer practice.
William quickly says no to his sister and goes back to what he was doing.
William's sister thanks William and their relationship improves a bit.
William's sister becomes annoyed with William and does not help him the next time he needs help.