Baily and Willow are very pretty!! I love the picture of them working and the one of them curled up in a ball together. That is soo cute.
I am not really sure what line Lucas is from. I got him from a Malamute rescue organization, so I have no clue really. I know he is full Malamute though. It seems his previous owners got him from a breeder, with papers for family line and all that, but their house cought on fire and they lost everything.
But I looked up Chayo malamutes and you are right, he looks a lot like them. So it is possible.