I know how you feel I have that with Corskcrew and Tibby. They both love playing the chase the feather game. If I bring out the feather wand for Corkscrew it takes a few seconds before Tibby is there or vise versa. And I feel bad because Corkscrew is so much bigger than Tibby that she doesn't get to play. So now once a dat I put Corkscrew in the bathroom with some treats or a little bit of canned food and play feather with Tibby for a little while. Then when Corkscrew is done with his treats I let him out and put Tibby in the bathroom with treats and it's her turn to play. It seems to work at really well.