We initially had two cats. Then adopted one mother and her baby cat. The mother cat was pregnant and then gave birth to 4 kitties. They used to just stay downstairs but now that they're becoming more playful, the run around and goes to the second floor. Now our two first cats, one is maybe 3 years old and the other is about 1 and a half year old. The younger one used to be playful but now she just seems grumpy. Most of the time she stays in the empty house beside us now (we live in row houses). She'd leave through the window and just come back for food, sometimes she'd stay for a while but leaves when other cats come around. She's usually alone next door. I got her home tonight and decided to just close the window. I hate to have her staying out as of she was a stray cat and unwelcome in our home. But she seems agitated most of the time and wants to leave. I'm not sure if she's fearful of the 2 month old kittens or what, but I want her home. What I don't get is that other older cat has gotten used to the kittens since we did try to introduce them from the first month. I don't know how she'll get used to the kittens. Do I just let her out if she wants to go? Will she be able to cope up that way or will she totally leave us that way?