Started? I don't think we ever stopped watching Christmas movies!
I have a very large collection of them and when my grandchildren come over that is all they want to watch and they watch them all year long. Even when they are not here I like to watch them too!
Right now my granddaughter is watching, To Grandmothers House We Go, with the Olson twins. I say watching, she is 3 years old so there's a lot of playing while it's on but she loves that movie! I wouldn't expect her to sit still through the whole thing. =)