Thank you so much for sharing his story and that is incredible that he was able to bring in everyone, and you and your husband especially, like that. 13 years is a long time to get to love on him and I'm sure he knew how much you cared for him.
I lost the last of my childhood pets about three years back. We had Zoey for 16 years, before she finally past away. I loved that dog. She was what made going home feel like home, and it's still hard to believe she's gone. It's always amazing the connection you can feel to your animal, and how much they feel end up being family members, not just pets. No matter how long you have them.