You should not abandon your family obligations.
David is going to a family reunion when his friend, Tom, calls and asks him to go see a movie.
David wants to go see the movie.
David tells Tom he can go see the movie with him tomorrow.
David decides to not go to the family reunion and sees the movie with Tom instead.
David's family is happy to see him at the reunion.
David's family is disappointed he did not show up to the reunion.