We have an existing cat of 15 and after losing our other one last year we took the plunge and got two kittens early August.
we kept them in one room for around 3 weeks and have gone very slow on introductions but now when we are home they all have access to the whole house (unless we are out)
our existing cat seems scared of them - it is getting slightly better in that he doesn’t run away now unless they come really close but it’s really sad to hear as he sort of cry’s when they come too close. One of the kittens in particular is so interested in him and just wants to meet him so sometimes when he runs away they follow which doesn’t help.
I have a feliway plugged in for him. Is it just a matter of giving him more time?