my adult cat grooms the rabbit and the rabbit grooms her and whilst they are not left alone together I dont have a problem with those 2 , the older cat was even hissing at the younger cat tonight when she came anywhere near, I only let it happen twice , the first time I didnt realise her intentions so I scooped the kitten off with a firm NO and tried again, when it happend the 2nd time I put the kitten in a seperate rooms so the rabbit could still free range, she hopped about happily examining everywhere and didnt seem stressed out at all, my kitten goes in the garden when my adult buns are out and they put the kitten in its place and if anything I fear for the kitten when the older buns are out as they chase her!
I wonder if the kitten is jealous as the bunny came in second to her and both of them are my babies, the kitten sleeps in my bed all night and the rabbit culrs up on my lap in the evenings which is why I would like them to become friends.
in all fairness if we are talking natrual instincts here the rabbit should be outside not living indoors but i felt she was to young and skinny to be out on her own at night this year.