dito ditto dito... except for 'doptting an older cat. I believe this depends on the age and health of the old girl. I think a kitten would be better with a carefully "supervised" introduction, complete with much love showered on both, and comparitively more to the senior, which I assume you will easily supply, will smooth out the transition for the old girl.

Now, I know I will get taken to task for this, but here goes.... get a male kitten and only get one new cat for now. If you get a female before spay, there could be a war, even if the female is just a kitten. Although this is just theory, because I have done this twice with an old female and a young ( before spay ) female and didn't have to clean up THAT much fur upon returning home from work each day.

Whatever you do, you should spend a lot of energy reassuring the old girl that her space is sacred to you and that the new one is also welcome. You should consider separating the two when you are absent for the first little while - at least several days.

Good luck and let us know how things go.

gnu