Green's daughter Sylvia lived with her mother until her thirties. Green disapproved of all of her daughter's suitors, suspecting that they were after her fortune. Sylvia finally married Matthew Astor Wilks on February 23, 1909, after a two-year courtship. A minor heir to the Astor fortune, Wilks entered the marriage with $2 million of his own, enough to assure Green that he was not a gold digger. Nonetheless, she compelled him to sign a prenuptial agreement waiving his right to inherit Sylvia's fortune.