Inheritance with stepsisters
I'm not sure if this is the correct forum or not, but here's my question. My grandfather re-married after the death of his first wife, my maternal grandmother. His second wife was rather poor, but very nice and did treat him well until he died in 1983, after nearly 20 years of marriage. She never worked while they were together, or for the remaining 40+ years of her life. He owned a successful grocery store and several rental homes, which he sold and invested the money when he retired. After his funeral, his second wife told my mother, my uncle, and her two daughters that per his last wishes, when she dies, a couple of the CD's are to go to her daughters, with everything else going to my mother. My uncle wasn't to get anything because he received a large sum of money from his father (my grandfather) with the stipulation that he could pay it back, or not receive anything upon his death.
His second wife continued to mention through the years that the home was to go to my mother.
His second wife just died this past week. Upon the reading of her will, my mother, who had been told for nearly 25 years that she was going to get the home and other investments, is to be given $25,000. The rest of the estate, worth a minimum of $250,000 (the home is on the market for $200k, and the life insurance policy was $50k, however we don't really know what is left in the various CD's, etc.) is to go to her two step sisters. Of course my mother's stepsisters don't remember ever hearing that my mother was to get anything.
We are in California. As there isn't a will from my grandfather showing his original wishes, is there any recourse for my mother to get what should really be hers?