How can I mediate a heated conflict between family members?

Anonymous
Hey. My family members have a deep conflict. Specifically, my mother and my father's sister - my aunt. My aunt is very close to me, She was like my second mother always. It starts in 2009. It's tense. My mother was feeling treated badly after marrying by her in laws, and had support from my aunt. But then, my aunt supported her mother (my mom's mother in law), and my mother got angry at her. The conflict started. My father always tried to mediate between them, until now the conflict was only talking badly about each other, and they refused to talk as well. Now, my father got stroke, and he needs treatment. They are now rivaling on which one will take care of him. My aunt is a medical worker, wants to treat my father at her hospital. My mother is not a medical worker, but clams the right as a wife to take care of him. They are doing their best: my aunt took a huge loan for my father's rehabilitation, and my mother rejects her. She has an only income as an Airbnb owner, and during one of their heated argument, our guests heard them and they left. So she lost her monthly income now as well. Meanwhile, my father is in an extremely difficult situation, he can't even move.
I see now that their conflict is not a light one, but it seriously causes loses from both sides: now even a financial lose. My father might be a victim of their conflict. But they are not even trying to reconcile. Each of them feels more and more hatred about each other. I looked both of them cry, my aunt cried because she did not sleep for a month and took a huge loan for my father, and feels unseen. My mother also cried because she lost her monthly income and we need money at home. But they don't even think to reconcile. I'm afraid they will become destructive and it will bring horrible results. Me and my siblings - two young adults and one teen, feel such a big pressure... What can we do? How can me mediate between them? I fear it will be too late if i won't take care of this now.
How can I mediate a heated conflict between family members?
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