@theoriginaldev your life as you know it will never be the same! Patience, consistency, a firm but gentle hand, with a sense of humor is what you are going to need for the duration of the life of your precious gift. WELCOME home little one!! :)
I only have one boy of unknown parentage as he is an adoption but my guess is that they probably do "know" family by scent if not sight. Their differing reactions to "family" probably relates back to the "pack" mentality. A female may have two daughters that she treats completely differently due to her perception of their ability to challenge her as "alpha" female in the future. I would guess it is similar for males. Time together as a "family", as with humans, is probably also a factor. Just my thoughts.
Thanks for sharing the story.
My dad and his two basenjis recently made the local paper. We had no idea he had been interviewed until two of my puppy buyers mentioned having seen my dad in the newspaper recently. They were very sweet and cut out the article for me so I could see it since I don't live in the Bay Area. The link doesn't have the photo that went with the article that showed my dad with Cole and Levi, for some reason called Guy in the article.
http://www.mercurynews.com/ci_9406464?IADID=Search-www.mercurynews.com-www.mercurynews.com