Reading whole-house remodel before you move in, I went a little crazy. I bumped out the kitchen to the sunroom/DR and sitting room (assume bottom right part of house is grandparents' domain), and extended the deck. I had the butler's pantry arranged before I read that you are moving the DR, so that could become a mudroom.

I added French doors to the sitting room, if grandparents want more of a connection to the kitchen and family, and added a closet in the entry, but if the grandparents want a private door to laundry, that door can stay:

Not being on a grid, the plan isn't exactly to scale--you'll have more space than what it shows (ap 22.5 x 22.5?), so I included measurements of aisles. The island seating won't actually overlap the fridge.

ETA, if you want the fridge closer to the new DR and living areas, the whole kitchen can be flipped, but new French doors to sunroom/DR would have to be omitted. You could do a pass-through from kitchen to DR, to the right of the fridge.