Tell me how to create a blended kitty family

[SentientCushion]

So I have definitely decided to keep two of my foster kittens and I need help on how to introduce them to the Royal highnesses that already reside in our house.
Currently they have 7 cats living in their spare room and haven't noticed. Or rather they are pretending not to notice like a wife who's husband has a second family in Poland but who pretends not to know to herself because she doesn't want to shatter her illusion of having the perfect family. They know, but they don't want to know.
So how do we introduce them properly?
We've been bringing the chosen kittens down to watch tv with us in the evening and our cats look at them in disgust but then go back to sleep. However if we try to put the kittens on the floor our cats hiss at them, not in a 'im going to kill you' way, more in a 'you utterly repulse me' way.
Are we doomed to have cats that we can never put down, or does anyone have any tips for making our resident demi-gods look favourably on the new arrivals?

It seems, from their Royal Highnesses behaviour, so far, they're not that bothered by the new kitties. At least they're ok to be in the same room as them. I think slow introductions is the way forward, with plenty of
play distractions for the RHs when the little kitties are around.

Any pics of the fur family??

Of course! Though I think I may have shared them all already but I'll post again.

Here are the current masters

Are you on Facebook? This video gives some good advice I think. Plus it is SUPER cute 😻 m.facebook.com/story.php?story_fbid=1142117589225757&id=861287430642109

They are bootiful.

So, I'm still struggling through 'introducing a kitten to an adult cat' - we're three weeks in and they're getting on better each day but still not quite there, so take this with a pinch of salt! I think you're going to need to let them hiss. Let them hiss, watch carefully and take the kittens upstairs quite quickly (and then make a big fuss of the adults), but I think this is a stage they will go through and you can't entirely bypass? Again, with the caveat that I'm not sure whether or not I've made a successful blended cat family yet, so others with more experience will doubtless have better advice!