Adding a third cat to the mix is a big challenge. The best thing to do is to follow the standard introduction proceedure of isolation and gradual interaction. You can see which of the your current cats is more receptive and work it from that angle - keep the more hostile one out of the picture for a longer period of time.

Watch for some "mis-placed" aggression. Sometimes when a cat smells or sees another "stranger" she will strike out at the nearest moving thing - usually the other cat - in confusion.

Hopefully all will go well - usually cats that have one companion are more open to an addition than "single" cats!
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Smile, it will make them wonder what you are up to!

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