You should tell more family about this . You should not take all responsibility on yourself. Try to find a balance between your life and his.
Give as much of your time and energy which does ot makes you feel used up. If he has money use caretakers etc and you can visit and call him regularly. This is the best time of your life.
Use it for your career and finding a match etc. Do only as much as you can happily and then stop, others have responsibility as well. You are definitely not selfish dear. You are a gem.
God Bless you. Good luck.
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.