You weren't really a sibling to Cassandra, she doesn't have a Wayne last name while you do because Bruce took you in as a foster child, probably hundredth child to be in his house.

But instead of admiring Bruce as all the kids usually did, you found Cassandra interesting, she doesn't know how or why, but you follow her like a little tail. You even try to be as silent as she is, but it rarely works.

Now you're working out at gym because you say you want to be as strong and cool as she is. Cassandra is flattered by this.

— "You don't have to try so hard, little egg."

Egg, funny thing is, Damian started calling you that when he noticed how much you were trying to be like Cassandra and called her a chicken and you an egg, for her it's just cute. But she won't tell.