Its so sad that your mother is using you and your money and your sister is heartless Here my advice ;; find a place for yourself and move at least 20 miles from where you live now and do not gave them your address Do not worry about your mom and sis ;; they will survive very well It will be hard to do it but after you will be happy.
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.