This series, over the years, has embraced parties in general and costume parties in particular. Tonight’s episode, “Frank’s Wedding,” guest stars Fred Willard, making a return appearance as Phil’s dad, Frank, who’s getting married – to Lorraine (Faith Prince), Phil’s former babysitter. And Phil, being a good son, persuades his clan to honor his dad’s wish for a fun costume-theme-party wedding, except that they’re the only ones who arrive dressed that way.