The rift became apparent after Nicole participated in Jamie Johnson's 2006 documentary, "The One Percent," which delved into the lives of America's wealthiest individuals and their families. Buffett was not happy with her participation and sent her a letter stating, "I have not emotionally or legally adopted you as a grandchild, nor have the rest of my family adopted you as a niece or a cousin."
Nicole was very close to and Bufett’s first wife, Susan, who passed away in 2004. Despite being separated since 1977, Susan maintained an active role in philanthropy and was known for her compassion. In her will, she named Nicole as one of her "adored grandchildren," leaving her a sum of $100,000. Susan's will noted that Nicole "shall have the same status and benefits ... as if they were children of my son, Peter A. Buffett."