As a mom of three and having a boyfriend in the house here's what I think. First I totally understand how you feel. And it's totally ok for you to feel that way.
You all need to have a family meeting with your mom ( without him there) and voice how you all feel about him. Let her know that you don't like him and she needs to put her kids feelings first. Everyone wants a good guy in there life as an adult but if my kids didn't like my boyfriend I would get rid of him.
My lids opinion matters first. That's it. Don't be afraid to voice your opinion and feelings ib a respectful manner.
She is after all your mom. Tell her what you go through let her know your sad and miss spending quality time with her.
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.