"Merry In-Laws" is a TV film made in Canada for the 2012 Christmas season. It's a fantasy and comedy romance that's mostly goofy while taking pokes at science. The plot isn't original - the son of Santa Claus, Peter, is in the real world and plans to get married. Alex and her parents need to meet his parents.
Oh, yes. Alex is a single mom who has a cute little boy - another established trait for many of these holiday films. But this film is a little fuzzy on her son's father. Her dad, Steven (played by Greg Lawson), is a scientist and mentions something about her attending a Stephen Hawking program when she was just 18 - against his wishes, where she apparently became pregnant.
There's very little plot and not much acting in this fantasy fiasco. Lucas Bryant, who pays Peter, spends much of his screen time tongue-tied and making goofy faces. George Wendt and Shelley Long as Mr. and Claus are mostly silly. Alex's mom, Joyce (played by Barb Mitchell), is a frustrated psychologist married to the science airhead Steven. Steven and Joyce too are silly in much of their roles.
One could tell this movie wasn't intended for family viewing right away. Peter and Alex are living and sleeping together, with her son in her home, even before they are engaged. This film is mostly a goofy hodgepodge with nothing to recommend it.