You've only been introducing them a week or so, right? thats not a long time... and Mowgli's going to resent the intruder the most since he's the last added to the family. Pouncer was a BRAT when we brought in Harry and Abby. then when I bring in new fosters, its Abby thats a brat, then Pouncer. For some reason, Harry boy is nice and welcoming of newbies (but I digress...)

It took Pouncer a few good months to return to happy, loving Pouncer after I brought in the kittens. For those first few months, he was growly hissy boy. And would NOT cuddle with mom. That made me soooo sad. Once he realizes another playmate is a good thing, he'll come out and play.