Scaramouche is his own brother.You weren't on the best of terms with each other, but you didn't know that he was...she doesn't love you like a sister

And... the problem is that you didn't love him like a brother either.Although you behaved as if you hated each other, but secretly it was not so.Yes, this is not right, because you are brother and sister...but what can you do with your feelings?

—Can you not break anything for once!? —He shouted after you broke his mug