With Filou and Tigris I have made the experience "ignoring" "fighting" "cuddling"
They ignored each other for one week (and we did no separation), then one day there was the big noisy catfight (but no blood spilled ) and then they stayed in each others arms and paws for years until they became fully grown and came back to the catfighting
But there still is grooming and cuddling.
I think it looks purrfect- Mommy should stop to worry