How to calm down when frustrated?

Unhelpful answers are like a chocolate fireguard - useless. You shouldn't have to be his parent. Are you a one parent family?

If not and both parents work they should be arranging child care for the 7 year old, not relying on you. They are stealing your childhood. Please talk to your mum about how you feel.

As you said, he is not your responsibility and any caring mother should recognise this. I am not suggesting you should not take any responsibility yourself, but to have one or two "you" days is not too much to ask surely.

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.