I also have a question I have 7mnth old cat we have had since she was 12 weeks she is great cuddly cat we just bought last night another kitten which is 14 weeks at first the older cat hissed and the new kitten didn't a couplen hours later the hissin stopped and she wanted to rough play with the new kitten now the new kitten growls and hisses only when rough play the older cat will bat her in the head occasionaly but seems harmless is this OK and since they seem to be OK when I leave can I keep them together or separate them

It's still to early to leave them alone together. They need more supervised together time. I'd give it at least two weeks without incident.

Thanks yes I figured better be safe then sorry I put the new kitten in my daughters room with plenty of toys and food since I will be working a 5 hour shift today my older cat always has run of the house
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Yes, and both with a litter box. :)

Yes lol they do both are great just my older one is still a kitten itself so she has the rough house in her still just is so much bigger then the other one and she doesn't understand that she is bigger I guess I think they will be fine

This week we introduced a feral female we've been feeding and socializing. Our indoor cats raised their heads from their cozy beds, glared for a minute, and then went back to sleep. Our local cat shelter has 60 cage-free cats roaming around with no problem. Casual and careful "play dates" are your best bet for getting them acquainted. The little one will grow fast and catch up in size.