Badly!
Okay, I guess that's the short answer. The long one invovles Simon and Rose getting ready for their wedding, Matt and his wife Sarah coming to surprise the family, and they're pregnant. Simon clearly has cold feet, and Rose may still care about her old boyfriend Umberto. Eric and Annie exchange ideas on how they think the wedding will play out, hoping either Rose or Simon come to their senses, one of their ideas has Mary showing up to stop the wedding. In the end, both of them do, but the families still celebrate at the reception. Mary's husband Carlos comes and tells them Mary couldn't come because she could only choose between the wedding and Matt's graduation from med school. AND she's pregnant again, as is Lucy. And apparently, they're all having twins, including Matt and Sarah. It just doesn't get any dumber, does it. Sandy shows up with her baby(I'm assuming Simon is really the father?), says her and Simon need to talk, but it's never revealed what about. They join the rest of the family for a happy dance, and the episode ends with a montage of scenes from the show's first season, intercut with each character as they are now. Pure cheese from start to finish.