We've had lots of little milestones with the three kitties. Nenya (the white one) is slowly becoming more chilled and less likely to chase the other two and bop them.
Fankil (the grey one) was terrified of her for a while (despite them being so close when we saw them at the rescue!) I think it was because Nenya didn't know Gothmog (the black one, and the youngest). So, when she arrived, Gothmog tried to play a bit rough: Nenya was in no mood for that, having just been spayed and suffering from mastitis, so she chased Gothmog, who ran to Fankil, who hissed and hid.
So for a couple of months we have had something of a state of war within the house, Fankil and Gothmog hiding upstairs, and Nenya ruling the roost downstairs. But things have got easier since Nenya has been allowed outside (and has discovered that the outside is the realm of the Giant Next-Door Cats, who are all about twice her size.) Also, Nenya does actually like cats, and I think she got a bit lonely. So we have been trying to encourage peace, and basically not spitting and tearing around the place like tiny furious loons in hot pursuit.
Today for the first time, Fankil went outside. I saw Gothmog leading him through the living room and then out through the open door (because it was sunny this morning I had the door open so the cats could dot in and out.) I was a bit worried that Fankil was going to just vanish, but no, he and Gothmog played with leaves for a little bit on the patio, then they came back in. Nenya has worked out how to use the catflaps, but Gothmog and Fankil haven't, yet.
And now they are playing in the livingroom, and Fankil just came and sat on the sofa next to me for a bit! Now he's gone a little way away, but he's still sitting on the sofa next to Rosie. This is very fine progress. I admit at one point we were starting to wonder if we would ever see Fankil, and then if we could possibly get all three to actually get along. But things are looking good now.