FP+ in two different parks for different members of group

[nicolem]

I'm here now with DH, our 3 DSs, and my parents. Our plan for months has been to go to AK tomorrow, and I have FP+ for us there. However, DS7 and DH have decided to go to SWW at HS instead. I've been playing around on the MDE website trying to cancel their AK FP+ (while keeping them for the rest of us) and add some HS FP+ for them, but so far I haven't figured out a way to do it. Is it even possible?

Thanks!