Tips on helping new cats and old cat make friends?

[Hot4Holes]

Picked up 2 new cats on Friday. They settled in immediately but when old cat was introduced yesterday it’s been a bit tense.
He started off friendly enough but then started to stalk the 2 new boys and this morning attacked the more outgoing of the two.

I have a feliway plug in but no idea if it’s doing anything, is it meant to smell? I’m giving them time together and time apart when we can’t be with them. Giving all of them plenty of attention.
What else can I do to create harmony? Or does it just take time?

How long was your old cat an only cat?
It will take time, but some cats prefer to be an only. To the old cat, you've brought 2 strange cats into his/her territory and he's not impressed.
Hopefully over time it will settle down as they get used to each other.

We’ve had him 1 year and he’s definitely made himself boss of the house!

If they have favourite blankets that can be useful to swap and le5 them smell each other scent. Make sure none of the cats ever feel trapped when meeting. Don’t force it. Give them time. Equal cuddling if they are cuddly cats.

We had two brothers who didn’t get on. There was always a bi5 of tension.

Also if litter trays the rule is a litter tray per cat plus one. See whether they like being fed on their own or together....

Much too soon to introduce them. They need to be apart for a couple of weeks. Do it slowly. My son has to come home with his two cats as he's lost his job and I dread to think what my ancient cat will think of this!! Luckily I can divide the house in two via a middle glass door.

The new boys are sharing a tray for now and seem happy with it. Have kept it in a different room from old boys tray though.
I’ve been brushing them with the same brush too.

Ok I will try and keep them separate as much as possible and see if that helps. Thank you.

Good luck. Do try scent swapping.