Batman has had several children, both sons and daughters, on different worlds in the Multiverse. His canon son is Damian Wayne, also known as the fifth Robin, sired when Batman was assaulted by Talia al Ghul. There are also several Earths that have a variant of the character Batman, Jr.. The Sons of Batman is a vigilante gang in the Dark Knight Returns universe mostly consisting of people who used to belong to the Mutants street gang. They started the Sons to begin following Batman after he defeated the Mutant Leader.