Board Thread:Anime/Game Discussion/@comment-39305512-20190429210747/@comment-39718735-20200619053631

It's unknown... Araki doesn't seem to like giving familiar info unless it serves a purpose in the story or just to complete a genealogical tree (referring to the SBR Joestar tree): we only knew Jotaro had a daugther in part 6 and she already existed during part 4. We didn't know about DIO's sons until parts 5 and 6 and they were already born.

Giorno didn't have any other purpose in the story after part 5 ended. In the genealogical tree he was alone at part 6 (although the tree from part 4 didn't have neither Giorno nor Jolyne, so they mostly contain relevant info). We'll probably never get any more info about him.