I am completely depressed. Any mistake!

I am 30 year old young man, working abroad. Recently my father is sick of nuerological problem and in coma. My sister who is also working abroad has come to my home. So we all are staying together my mom, my sister, my wife and myself. There was a severe verbal fight between my sister and my wife. My sister went back to her place and my wife is now at her hometown. Both are denying to stay with my mother for moral support. I could stay with my mother but the problem is the medical maintenance of my father is very expensive and I couldn't arrange those funds unless i work. I am completely depressed and how could I convince them that father is much important than any other. I am convincing myself to be strong but at one point or the other I am feeling that i may commit any mistake