I just adopted a 6 month old kitten Marley on Friday. On Monday we introduced him to my 2 year old Blue. At first Blue was a little aggressive with Marley but now that has seemed to stop. (Unless Marley goes near her food). Today they have been chasing each other around, is that a good sign that they are playing with each other or is this a bad thing? I don't have much experience with this. When we adopted Blue I had my 16 year old Misty, who passed away on 7/23. The two of them never really got along they just tolerated each other. They never chased each other though. Sometimes Blue would try to play with her but she was very old and wasn't interested. Any insite on this is appreaciated.