My two 7-month-old kittens, Mochi and Emma, haven't always gotten along (they are not from the same litter). When we first got them, they would always fight (Emma would hiss at Mochi) and even up till a week ago Mochi kept biting Emma until she cried. Today, however, they have been grooming each other for over an hour!! It makes me soo happy lol. It's also super cute. Hopefully this means they are going to get a long well now!!!