Welcome home Logan!!!!!! It is so nive that he is back with the family that loves him so much! That is also great that he is using the litterbox and eating. Looks like the sweet little guy is going to be just fine. I wouldnt worry too much about your other kitty hissing at him, as soon as the "vet" smell is gone, they will go back to being buddies! What a great Chirstmas gift!