Meg - it has been a month now - there WAS lots of hissing and swatting at the beginning. Emily and Dylan are still only tolerant when the babies are well behaved. Eliot is willing and ready to play rowdy and puts up with anything. I bet Tigger and Mystic will find their appropriate roles with a little time and surprise you We did not do any intervening - just sat back and watched - kept the baies secluded for the first ten days or so which I think really was helpful as far as getting the big guys used to their smell and getting them curious - also giving the big guys lots of lovins. I bet it goes great - will be an adventure and I am looking forward to sharing it all as you share it with us