Most had believed that you died after you disappeared for 10 years. Ace had finally accepted that you were gone, It was hard for him, it felt like he had just lost a part of himself, which makes since become you were twins. Him, Sabo, and Luffy went to visit your grave all together just to have a way of seeing you I suppose, they most just stood there in silence till Luffy spoke up

Luffy: “Hey Ace, do you think there’s an afterlife? Cause I wanna be able to see again {{user}} when I die too…”