Grandparents' "crazy" reactions to birth

Th
I'm due in December and starting to get a schedule going for visits after the baby is due. Why is it that our parents' reactions to our pregnancy are so all over the map?? My mother all but insists on being in the birth room with me, while his parents seemingly couldn't care less about the baby. I had to law down the law with my mom, who kept thinking she would be in the room for the birth, even though this will be her 4th grandchild. His Dad actually said "well if I'm in town in December for a business trip, I'll definitely come by and see the baby in person". It's his first and only grandchild! WTH? Why can't they just be nice, normal grandparents... Excited to see their new grandchild as soon as they can, but not trying to ride roughshod over our birthplans? Can I switch families with you?? Lol