I have to greys, a TAG, 6 years old and a CAG, 4 years old. I have had them both since weaning. They are not friends and do not bond or even talk to each other. When the CAG was younger the TAG "mothered" him but now that he is older forget about it. They do not fight and the CAG will follow the TAG for room to room. My TAG, the female and older is the boss. She is much smaller than my monsterous CAG.