Some of your great grandpa's children are your grandparents. Their grandchildren are you, your siblings, and your cousins. Your great grandpa's other children are your grandparent's brothers and sisters (your great aunts and great uncles.) Their grandchildren are your first and second cousins.
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.