Indoor cats like Boomer are more attached to the people in the home rather than the home itself.

Mango, Bubbles & Peaches, all indoor cats, recently moved to new digs and there was hardly a ripple in their lifestyle since the people they know and love were there. They just had new places to explore. Bubbles always hides behind the pillows or under the covers on the bed so she and Boomer would get right along!

My mom's indoor/outdoor cat, a Russian Blue named Binky, seems equally attached to her as he is to his home (his territory maybe?) and would probably be hard to move to a new place.

I suspect Boomer will be much more settled and more brave once Missy & Tyler are with him.