Evening everyone, thank you for the welcome, and thank you for the responses.
Yes Nicky, I had wondered that. Perhaps Bella and Jasper are very worried they might be re-homed again and the kittens are a threat to them.
What we have done since I read these posts has been to take our time and try to scent swap between rooms.
Bella and Jasper tend to sleep in our bedroom at night, Bella sleeps in either 'the cats room' which is our 2nd spare bedroom which has Fudge the rabbits hutch in it, on top of the hutch in a bed, while Jasper is on top of a box we gave them with a large bed on it in the same room. Or she sleeps behind the sofa in the living room, while Jasper is on my leather computer chair in the other spare bedroom where my computer is.
The kitchen is where they eat, and the 'cats room' is where their litter tray is.
We have put the kittens in my computer room so that they have company from me if I'm in there. Bella and Jasper have the run of the rest of the house.
This was an initial switch from the living room where they were the first two nights as B and J do spend a fair amount of time in that room with Cheryl when she is watching tv.
The kittens are very playful and seem to have settled nicely, they play with each other all day, purr when Cheryl and I are close, play with us as well, then huddle beside each other when they sleep. So I have no concerns with them so far which is great.
Bella and Jasper haven't had any issues since the box incident which is good. Both of them seem happy enough, although funnily enough actually a lot more affectionate.
I switched the kittens into the cats room from about 11:00 this morning until about 20 minutes ago. 20:00, food, litter tray toys etc. let them run around, lie on B and J's beds etc while B and J were allowed into the computer room.
When B and J went in they just sniffed around a bit, nothing more than that then walked off with a look of intrigue but slightly on guard. The kittens ran from room to room when we were moving them with no issues at all while B and J were in the living room.
They have had a ball in the cats room, rolling around, playing, sleeping, eating etc, no issues at all.
And since moving them back to the computer room they are again fine, eating behind me as I type.
Jasper has been into the cats room, had a sniff around and seems fine, usual strange look on his face. Bella is still asleep, i'll let her go in in her own time.
So far so good I think, I just don't know how much longer I need to do this? Where to go next?
I was thinking of getting them a box or a cage eventually so that B and J could see them but not get to them. Could walk up and get used to them?
I really don't want to rush it after last time. Any advice?
Thanks
Ross