We got a 7 week old kitten 1.5 months ago. (so now she's 13 weeks old). We already had a 3.5 year old cat. They are both Domestic Short Hairs or mixes. Anyway, at first they looked like they weren't getting along. The older cat was constantly hissing at the kitten and the kitten would "wrestle" with the older one. They wouldn't stay in the same room together.
We were worried they wouldn't get along...
Anyway, now the kitten follows the older cat everywhere! And they even sleep together sometimes. Sometimes I see them grooming each other. However the kitten likes to "jump" the cat and the older cat "sumo wrestles" her.
But if they are grooming each other, that's a good sign right?