My two sons liked "active" party games more than crafts, but they both love cooking. Make sure that some of the games involve some running around like "tag" or a basketball type game, etc. I think making the Tiny Treats is a great idea. The boys would like that. Let the boys retreat and play on their own with playstation, etc. as needed. It should all work out fine. If the boys need a break, they will let you know. We often had family birthday parties that included different ages and sexes. If the party is at your home, the boys will have plenty of opportunities to do other things if it gets too "dolly" for them. Also, your sons may not want to show an interest in dolls in front of their "big" cousin if he is someone who might tease them a bit about it or if they want to be cool in front of him. My son would play dolls with his sister in private, but if there were other boys around, he wouldn't.