How do I introduce a new cat into a home that already has two cats?

lalalogic asked:

I have a young cat and I’m moving away. Sadly, my cat can’t come with me and she is going to go live with my mother who already has two older cats, one is very skittish and the other is very bossy. We don’t want anyone running away because they think their territory has been invaded or there’s no place for them. How can I introduce the new cat to the other two without upsetting any of them too much?

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