We got Tommy when he was about 6 months old and Tasha was 2 years old. He obviously adores her a lot, loves to play with her and follows her lead in many things, but his deepest bond is with his people. He will follow us over her and cuddle with us and choose to be in whatever room I'm in regardless if Tash is there or not. If I call him and don't call Tash, he will come even if she stays where she is. I'm positive both of them are bonded most deeply to us, though they do share a bond with each other too. If I take one somewhere and leave the other, they are both elated to see each other when I come back home, but don't show any distress while the other is actually gone.