Re: Johanna Mason, Ellen and Harriet Mason
1910 US Census
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Mason, James W., aged 84, single, b. Ireland, immigrated 1846, naturalized, own income
Mason, Harriet, sister, aged 82, single, b. Ireland, immigrated 1846
1900 US Census
Mason, William, aged 73, single, b. Dec. 1826 Ireland, immigrated 1850
Mason, Harriet, sister, aged 71, single, b. Feb. 1829 Ireland, immigrated 1850
James/William may be the same guy.
Finding death certificates may get you the name of their father.