This isn't about Sophie, but about my dad's cat. He has two cats already, Bobby and Bobinha. They are great friends but aren't attached at the hip or anything. Both are fairly independent cats, not too vocal, clingy, etc. Bobby tends to just loaf around and play with Bobinha every now and then; he plays rough. Bobinha is fast and active, plays all day and likes to keep her people in sight. She plays nicely, mostly just chasing and batting with paws gently. They are both adults (almost 2-ish).
Introduce new kitty: Mimosa. She is an extremely tiny young cat, around 1.5 years. She is playful, active, friendly, social, and grew up around other dogs and cats. She had no problems in her previous home, and was raised by the foster mom as Bobinha. She's a great cat, but seems very uncomfortable in her new home. I talked to my dad and stepmom about proper transition and they did everything pretty much right; they were very cautious and gave Mimosa PLENTY of time to adjust. We kept her separated from the other cats for the first week or so with heavily supervised and limited positive interaction. Everything seemed to be going great! She would play with Bobinha when they were together, though Bobby was skittish of her (he got over that, it wasn't too big of a deal). Eventually she was given free reign of the house. Doors were left open for her to escape to if she felt uncomfortable, but everything basically happens downstairs here. She is fed downstairs and has no problem with that, she eats with the other two cats and it's fine. But even still, a month or two after owning her, she is hiding upstairs ALL the time. She will not leave this one room other than to eat and use the box. She is totally comfortable in the room, relaxed, chill, cozy, and likes to be petted. She is fine if the other cats come in there, but does not relax outside of that room.
I worry that she is afraid of my dad. She grew up with a kind of small woman who knows cats very well and probably was nice and calm with her. My dad is a tall man with a very deep voice, and he yells a lot. Not necessarily angrily, but he fusses at the computer, the TV, the kitchen, etc. in a very loud, booming voice. I'm worried it could be scaring her away from the downstairs. But even when he is not home, she remains upstairs. He works and travels (and once, when he was on a long trip, she actually DID spend her time downstairs with my step mom and the other cats, but that was the only time). He is going on a few trips soon, and I told my stepmom to see if Mimosa stayed downstairs while he wasn't around.
Do you think her behavior/fear is as simple as she is afraid of my dad? If so, what do we do?? He LOVES this cat and doesn't want her to be afraid her entire time here. It's very upsetting, and he only wants the best for her.