Archie and George
Sadly, Archie is not to be a father after all. Luna had only one pup and it was still-born. A great pity as they would have been beautiful.
Anyway, Archie seems to have taken on a paternal role with George - grooming him, batting him with a paw if he's misbehaving and growling if he tries to eat Archie's food. They are not dissimilar in colour so maybe Archie thinks George is his....