The film takes place over Christmas weekend at the Fowler's home where Alana Fowler is planning her wedding to Kirk. Alana and her brother Paul are both adopted by Richard and Meryl Fowler. One of Alana's friends, Roy, who is coming to help with the wedding planning, is an ex of Paul. He doesn't want Paul to see that he is still single all these years later so Roy brings Gavin along to pretend to be his boyfriend. However, Gavin and Paul end up falling in love. In addition to that Richard has just been diagnosed with early onset Alzheimer's. The family has to figure out how to cope with that while planning the perfect wedding.