escargot has a good point regarding the Gardner Museum. Your sons may enjoy the MFA more, which is right across the street. Since the Go Boston card covers both, perhaps you can go to the Gardner Museum and send them over to the MFA; then meet up later.

Or, you can have the boys and your husband visit the Mapparium. It is near the Prudential T stop, which is just a few stops from the MFA T stop. The men can go there while you enjoy the Gardner Museum. Mapparium is also included with the Go Boston card.
http://www.smartdestinations.com/bos...Mapparium.html

BTW, if I'm reading your posts correctly, you are arriving THIS FRIDAY, right? The Tall Ships are here now through Sunday, so you may want to head into Boston from the Cape a bit earlier on Sunday if you want to check out the Tall Ships before they leave.
http://www.sailboston.com/

Thanks, again! I do think we will replace JFK Museum with the Mapparium. China I think we will park in Prudential and enjoy the walk down and maybe get away from some traffic leaving. Also, thanks for the warning about the food at Fenway, but I just got the tickets from a business aquaintance in Boston and they happen to be suite tickets! We are blown away! So we should have food included! Amazing! I have done another post with a revised itinerary thanks to all of your suggestions!