An utterly ridiculous premise. A girl breaks up with her boy friend, and kidnaps a guy with hand cuffs to get him to pose as her boy friend for Christmas with her family. Make sense? Of course not, but it doesn't matter.
Even using her Sabrina powers, I doubt the tiny MJ Hart could over power Mario Lopez. Nor is it likely the parents would be fooled by this absurd scheme, especially when the guy starts yelling to them for help! Well, it's a rom-com, so anything goes. On top of that, the Christmas theme demands the exact sentimental outcome you'll see coming more than 50 light years away. Even if you can't give it the poetic license it needs (a lot, lol), you can still laugh at how ludicrous the whole thing is.
Silly nonsense, but utterly harmless. For a brainless diversion, this one, believe it or not, works.