2 cats moving in on one

Question
My son will be moving in with us  with his two cats.  My
cat has been an only cat all his 8 yrs. He has an exotic and a tuxedo.   Mine is a all grey.all males How could i get them together He won't move in till end of july so i have some time.  Is it fair to keep them separated in different rooms .  I'm concerned for my cat who has been the only one and might change his habits or behavior. What is the best way to accomplish this task?

Answer
Bernie,

The problem is that you do not know how they will get along until you try it.

So, here is a protocol we recommend people use when introducing a new cats into a household where there are already pets.  I am assuming that all 3 boys are neutered.  If not, that would be the first order of business.

Start out your new cats in one room with a litter pan and water dish. Ideally, the one room should be a bedroom with your son. This accomplishes a couple of things. The new cats will not
be overwhelmed by their new surroundings and get "lost", and thusly will have no problem finding the litter pan (especially if they have been confined to a small area). You will feed the new cats in this room and keep the established cat out. It allows the new cats to build up some self assurance in their new surroundings since they will not have to compete for food or
attention right away. Finally, it allows the new cats and the established cat to sniff each other under the door and get familiar with each others' scents.

After 5-7 days of being in their one room, it is time to let them meet each other. Be prepared for some posturing, some spitting and hissing, and the like. IGNORE IT! After a while (maybe immediately, buy more likely after a number of weeks or even months), they should begin chasing each other about and still have the occasional hiss or spit as they get accustomed to
each other. Cats tend to make a whole lot of noise and even loosen up some fur. Rarely will two cats hurt each other.

Once they are introduced, there are a couple of things you must remember. Do not separate them again, they will get along! Do not interfere in their "discussions" as they need to sort it out amongst themselves!

It does not hurt to give the established cat treats and extra attention after the new cats are introduced (yes, cats do get jealous!).

A couple of things you may have to do are to feed them on separate dishes. Provide more than one litter pan in different areas of the household (as cats can be very territorial about litter pans).

All, in all, this method seems to have had great success in the past and makes for a fairly smooth introduction. Please remember that they may make up immediately, or it may take a few weeks.

Please let me know how it goes.  

Best regards... Norm.