If he's your full brother, than she's your half sister too. I would just call her your sister because you've got half the same blood. I've got 2 half brothers (same dad, different moms) and me and my other 3 siblings call them our brothers.
Actually, I get angry when someone tries to call us their "step siblings.
If he's your full brother, She's also your half sister. You have the same mother.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.