Mason the feral cat was ill, injured, and infected when he was taken in by Tinykittens feral TNR program (previously at Neatorama). Because of his condition, he was placed in a home instead of being returned to the feral colony. Mason is only semi-tamed; he still won't let anyone pet him.
But he has adopted a litter of kittens placed in the same foster home. They make him happy. There are several more videos of Grandpa Mason and his kittens at Tiny Tuxies. -via reddit