Though the characters debuted fairly close together and in an era when "Martha" was a more common name, Superman's adoptive mother was not named until years after his first appearance. As noted in another answer, it was 1951 before her name became "Martha", having previously been "Mary" and "Sarah".
Thomas WayneMartha WayneBatman/ParentsAmassing a vast fortune, Thomas and Martha Wayne did their best to help make Gotham a better place. Other than that, there's not much that comic fans know about Bruce Wayne's parents.
In Joker, Thomas Wayne (Batman's father) and Penny Fleck (Joker's mother) are key characters. Penny claims that Thomas is actually Arthur's father. The movie wants you to guess for yourself who's telling the truth.
Penny Fleck is was the adoptive mother of Arthur Fleck, a mentally unstable failed comedian who would later call himself the Joker. Much like her son, Penny suffered from an unspecified mentally illness.
Thomas WayneIn Joker, Thomas Wayne (Batman's father) and Penny Fleck (Joker's mother) are key characters. Penny claims that Thomas is actually Arthur's father.
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