Bruce Wayne, Jr. was the biological son of Bruce Wayne of an alternate reality in which the elder Wayne married and had children. Bruce Wayne Jr. read more
up vote 20 down vote favorite Recently I was reading something on the internet about Batman, and they mention his daughter, Helena Wayne, which he had with Selina Kyle. read more
And in an alternate version of Post-COIE continuity Bruce had a son with Talia who's effectively an alt-version of Damian Wayne named Ibn al Xu'ffasch. And in another not very well explored Earth that was alluded to in a pre-COIE story, Bruce had more than one child with Selina. read more