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."
However, Louise insists she has not challenged her brother's estate over the cash, adding, "I don't care about the money, it's been over ten years and I haven't made any ripples."