Disclaimer - I own nothing you recognise.
That's What I'll Be
I watch as he fall's further in to Grindelwald's grasp, becoming less interested in the things that actually matter, Ariana for example, as he listen's to plans of The Greater Good. I don't even recognise my brother anymore. I spend my time looking after my little sister, she like's it I think, she like's being around me. She knows she's the most important person in my life, something that can't be said for Albus any more.
When my mother died, Albus promised to look after us, promised to take care of us. That's not happening anymore, it didn't really start if I'm honest. Albus has always been perfect, perfect at everything. He hate's anything that isn't perfect. He loved Ariana, more than any of the rest of the family, when she was younger, when she was healthy, when she was whole.
Now that Ariana is 'broken', Albus doesn't want to know. So I take on the slack, I look after my little sister, because she doesn't have to be whole for me to love her. I look after her instead of doing my homework, instead of burying my head into a book in an attempt to add another bit of knowledge that will be unnecessary in the long run. I look after my little sister, not because it is expected of me, but because I want to, because I can, because she need's me.
Albus think's I'm a waste. He doesn't say so, he doesn't say much to me any more. He's dismissive of me, and while I'll never tell him that, it hurts more than if he was openly hostile. I worry about him. He's sinking into the dark, all the while pretending he isn't, and I fear he's going to sink so far that he'll never be able to free himself.
I'm worried about what's going to happen to Ariana when I return to school, who will be here to take care of her then? Oh, I'm sure Albus will feed her, make sure she's clean, but that will be as far as his 'care' will go. I've never wished anything bad to happen to someone before, but I wish Grindelwald would just...go away. I don't care if he leaves under his own steam, or if he get's hurt, I just want my brother back. I want to know that my sister will be looked after. I want to be able to be a child, while I am still young, but I fear if I give into such a desire then Ariana will be hurt.
Instead, I'll stay silent in the background, taking care of my little sister, watching carefully for any sign of the brother I remember. My childhood may be over sooner than it should be, but that's the price I'll pay for family. I may not be 'brilliant', but at the moment, I'd rather be a brother. And that's what I'll be.