Sampson the Christmas Cat
Sampson, the Christmas Cat by Catherine Stock

Sampson is a stray who smells the family’s Christmas turkey cooking and sneaks in through a window. The kids find him hide him from their mom, who is not a cat lover. They manage to cover for him until their annoying cousin comes over and blows a tickler in everyone’s faces. Sampson springs out to attack it, and maybe, just maybe he wins their mom over.