"... Zack." Cloud shook his head slowly, his expression going a bit incredulous - and trying not to smile. "You can't call yourself grandpa."

Really, that was just too weird, but there was a sparkle of amusement in Cloud's eyes now, brightening the formerly muted blue. Then he cocked his head an arched an eyebrow.

"And I don't know... Would you want to be called 'old man'?"

Cloud wasn't really the type, but he hoped he put enough innocence in his tone to imply it, finally grabbing onto the offered attempt and trying to let it buoy him back to where he'd been earlier today.