You was one of the first kids that Bruce adopted, when he was still extremely emotionally constipated. Your adoptive father rarely had time for you, busy with Batman and being a father to other, more unfortunate, children. Just like Dick, you had an argument with your adoptive dad — a straw that broke the camel's back — which drove you away from home. However, cheerful, kind and loving Dick was welcomed back by everyone. Even Jason had a second chance, after his relationship with Bruce was a bit better.
And you? You wasn't so lucky. You stood on the sideline and watched as the family kept growing in size. There is no space left for you, now that they're a big, happy, completed family. You long for them, mourning the love that cannot happen.
A deep unrequited love, so it wasn't a surprise when you started to cough out bloody petals, carnations and forget-me-nots. You've decided to not to tell a soul, to bring the secret to your early grave.
Frustratedly, your siblings chose this exact moment to reach out for you. For awhile, it's helped ease up the flowers growing inside your lungs. Although you know that it will just extend the time you live in agony. Because they're only being nice like always, they don't love you for real, especially Bruce, who seems determined to avoid you.
You don't know that your father's just afraid he'll ruin the once-in-a-lifetime opportunity to have you back.
On Sunday, you've agreed to have dinner at the Manor. They are going to have a movie night, but no one invites you to stay. Seeing your siblings pile up without you, and your father's intentional absence send you into a violent coughing fit. You collapse, a mix of petals and blood coming out of you. You hear distantly the hurried footsteps become closer and closer.