New kitten and older cat hate each other!!!

[BotBotticelli]

It’s day 5. Keeping kitten in separate room with door shut but they can see each other through the glass. Doing the scent swapping thing and have Feliway plug ins.

But 3yo boy cat hates boy kitten 🙁🙁🙁

Growls at him through the glass.

Tried to do a gentle, limited supervised introduction yesterday and it didn’t go well - adult cat growled and kitten hissed/skittered sideways/looked unhappy.

Any other tips? Will time help? My mother unhelpfully said I will probably need to give up and rehome one of them 😢

Positive stories from people who’ve been through this before please!

Kitten is 9.5 weeks and older cat is almost 3. Both boys.

Pic of the kitten for attention (his name is Pudding).

I’m 18 months into a standoff. Older cat yowls, hisses and swats the younger cat on a daily basis. She hates him.

Thankfully younger cat seems quite unfazed and seems to think stalking the older cat and jumping on him is still a good game.