DEAR ABBY: My fiance, “Rowan,” and I are getting married this year. It is my second marriage and his first. Rowan has a young son I’ll call “Sean” from a previous relationship. I have a good relationship with Sean, and expressed to Rowan that I’d love to include Sean on our honeymoon, so we can have a proper first family vacation. (Rowan’s custody agreement states that no unmarried parties may live together when their child is present in the home.)