My parents bought a house in 1971 for $xx,xxx, my dad died in 2006. She deeded the house to my sister in 2008 but my sister died in 2009, and the house reverted to my mother. In 2016 , she deeded the house to me. She passed away in 2023 and I sold it for $xxx,xx. What is the basis of the house I use for tax purposes?
