Just change the text when it pertains to gender. Costumes for each of the different versions of the characters should be the same. If you have a disproportionate amount of girls or boys available, have a female play a male part, and vice-versa. Costumes for each of the different versions of the characters should be the same. Then a series of wishes that come true take place.
Family members keep getting replaced.
Three sets of Jack's, Stevie's, Mom's, Dad's, and Binky's make their appearance by the end of the play. The play ends with Binky the dog in full control of the house. Hey, your piece of cake is bigger than mine. No, it isn't. See, it's the same size.