1. Family matters
As the movie strapline points out, the only thing crazier than love is family. Nick was too naïve by not giving Rachel some context to prepare her for what she would be contending with upon arrival. Each family has its own idiosyncrasies but some are more difficult than others so if your family is as insular or traditional as Nick’s, you will want to give your partner a heads-up so they can be better prepared and have a better chance at winning them over.