Louise Harrison was given monthly pension payments by the musician up until his death in 2001, but the money was stopped around a year after the star passed away.
The 82-year-old now admits she has no access to her brother's multi-million dollar fortune, and is cash-poor living in rural Missouri.
She tells Britain's Daily Mail newspaper, "It was my pension from him -- it was his intention to make it last my lifetime. He said, 'Given my financial situation, there is no reason on Earth why my sister should ever be in need.' But I was never concerned about the termination of the pension, I have found a way to make a living. ... I am struggling for money, like everyone, but I am not on the breadline."