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Imagine Jason Todd and Cassandra (Cass) Wayne (because there is no way she is keeping the last name "Cain") where bio siblings (twins or something) and Bruce only found out after Jason died.
Now Bruce has to deal with Jason's death (please get some therapy) Dick finding out about said death, a new daughter ( because no way is he turning away his sons sister and this small pint-sized child that appeared at his door. ( And there is a up and coming Crime Boss ) ( maybe add baby Damian too)
Counter AU is when Jason tries finds if he has any relatives he find out he has a older (because I find it funny that Cass is older then Jason because he is built like a brick wall) sister.