Or even any older sibling that was born as early as the 1960s (or well before Thomas Wayne became a doctor)?
This show does seem to be making a lot of new stuff up (which is weird, but not always bad). I'm wondering where they plan to go with this bit...
Shout by Hawknuts64BlockedParent2021-04-14T17:39:15Z
So did Bruce have an older sister that died also?