Parents want to divorce

Assalam aleikum,

I am 26 years old and live with my familiy in Germany. I am finishing my Master and today had a halftime job offer as teacher which I am going to accept.

My parents are fighting and my mum wants a divorce. The problem is, my father doesn't work, my mother does. He is a stay at home dad. So today he came to me and told me, that as I am working, him and I can move out and rent an apartment and my mum can live with my other 3 brothers in our current apartment. He said the same thing to my younger brother (22) who is already working but and has already everything planned to go in February for a vacation. 

I don't want to move in with him oder my mum. If I could and if it weren't for my youngest brother I would move out and let them fight their own fight. But they aren't fighting fair. Both are trying to get us on their own side and I am not strong enough for this whole thing. If I told them I want to move out, I know what my dad would do. 

What are the islamic rules concerning this topic? I would give my dad the money to move out but I know that he will never speak to me again because he will say I wasn't a good daughter to him and that I am just as bad as my mum. If I move out with him, my mum will say the same thing to me. 

I don't want to get involve but they don't understand. I am so tired of everything. Because of them I am always sitting in my room. Trying to minimize the contact to them and at the same time be a good daughter. 
I really need help, because my dad always says read the quran to prove that he is the one who is in the right. And my mum starts to cry which I can't handle.

Thank you in advance and excuse my bad English.