Grandparents want time just with grandchild? No parents allowed?

Chelsea

My parents are visiting from another province over and being their only grandchild that they don’t see all the time they want to spend every waking moment with him. Fine whatever but now they keep saying they want to take him on a road trip no parents just them. Not far I’d imagine but I’m just not comfortable with it. I ask why cant I come and they get all offended saying they just want time with him. Should I just chill?