I'm Scrolling Through Marineford Again To Gather References And This Is The First Time I'm Actually Noticing

I'm scrolling through Marineford again to gather references and this is the first time I'm actually noticing this dialogue:

(Chapter 568)

"Do you have grandkids, are they happy?"

And Garp says "His name is Luffy, I think?"

Is this just a vague translation or a misplaced punctuation mark? Because like this it makes it sounds like Garp knows about his grandchild, but he is not sure what his name is and is not the one raising him.

He can't answer if Luffy is happy, but he is "being raised well." Whatever that might mean in Garp's books. Luffy must still be very young here considering Ace is maybe... 5ish? This is probably within this period of life Luffy wouldn't remember. A period of time where Dragon (with or without Luffy's other parent) might have been taking care of him until something happened that made Dragon give Luffy up?

Hm hm hm.

Or maybe it's just a unclear translation or a misplaced punctuation.