Oh, could take a while, Jugglering! They'll form a truce eventually - it may be an uneasy one, but they'll tolerate each other. I have 2 ten yr old females (spayed) and 3 yrs ago, I took in a "sweet" little lass who'd been thrown out by her previous owners and was pregnant. They're all tortoiseshell, by the way, which could explain a lot (they can be quite feisty!). Anyway, when the stray was eventually introduced into the house, she promptly attacked the older ladies, so she was banished to one of the outbuildings again. She had 8 kittens in our caravan and I've still got her (now spayed as well!) and 2 of her babies, a lovely little B&W female and a Ginger male. The older cats, who are sisters, get on OK with the little ones, but their mum is still a problem. They all live together now in the house, but they seem to have worked out who goes where and, like I said, there's an uneasy truce. Mind you, when the local nasty tom comes round, they all gang up against him!! good luck & just persevere! K xx