My brother's wife is trying to steal the family house away from our family and now it's causing a huge sibling dispute

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My parents had purchased a home long ago, with the intention of using it as a source of income in retirement or passing it down to my siblings and me. However, they put the title in the name of a family friend, a family member, and most recently, my older brother, instead of their own due to personal and financial reasons. They paid the mortgage at all times until my dad retired five years ago.

Since their retirement, my parents have turned to us, their children, for financial support as they have no source of income. The PITI is around $3,000 a month, which my brother, who is a surgeon and the most financially stable, has been covering. My sister and I have also been contributing to our parents financially, including their meals, trips, and casual spending money, on top of sending them $500 a month. However, my brother's wife, a SAHM and retired nurse, is unhappy with the arrangement and demands that her husband's financial contributions be tracked and recouped with interest when the house is sold. They keep a detailed spreadsheet of every dollar my brother has paid toward our parents' living expenses, with the intention of recouping interest.

Although we are all fortunate enough to be in a position to individually cover the PITI, my brother's wife now demands that it be split equally among us siblings. I agree with this proposal, but I'm uncomfortable paying for a mortgage where the title is solely in my brother's name, especially since my sister-in-law has been calculated in her approach to my parents' spending. The transfer of the title to a vehicle such as a trust, which we can administer equally, is a solution I propose. This way, we can all contribute equally to the PITI. Unfortunately, my brother and his wife disagree with this and want to keep the title in his name and split the PITI equally among us.

This has caused recurring discord between myself and my siblings, particularly my older brother. Any advice or thoughts on how to handle this situation would be greatly appreciated.