Serving one's mother

I am the only child left from three siblings. 6 years ago my wife any myself made a decision to move from Cape Town to Gauteng along with our 3 kids. They are aged now 14, 8, 9. My dad passed on two weeks ago which is leaving my mom alone in Cape Town she is disable and not working. I want to know what does Almighty Allah and the Quran order me to do as my wife is refusing to move back to Cape Town and I want to move as I am not happy in Gauteng in any case. I want to move back to look after my mom. She needs me. In my view a wife is replaceable but my mom not. My wife and myself don’t have a “healthy” marriage in either case. Help me I do not know what to do I cannot sleep or concentrate nor do I eat. This is eating me up.