My dad is going with us to DL next summer. My really dorky reason? I want to ride on rides too, and don't want to be limited to only what La is willing to ride. She's adventurous but shrimpy, and her height would keep us out of the most fun rides. So dad is coming with us, all expenses paid, to be one heck of an expensive babysitter!
That being said, I would ask DH more of what his thoughts are. Does he want it to be a "real" family vacation (ie, just your immediate family), does he feel that you guys do "so much" with your parents that he wants to do this with just you and the DC, is he concerned about the expenses incurred with inviting two more people? I'd see where he is coming from and what his thought process is. It will be much easier to have a discussion about it when you know his side of things.
--Mimi
Mom to Lala (2004), Bonus Mom to Big Sis 1 (1991) and Big Sis 2 (1992)
Grammy to Big Kindy Kid (2011), Big Pre-K Kid (2012),
Grandbaby Appendage (2014), and New Baby Grandboy (summer 2017)