Hi Katie, according to the U. S. census reports, there was a 20 year old Margaret A. (or O.) Aldrich living with Charles R. and Margaret M. Aldrich in Seattle in 1910. She is shown as being an adopted daughter. There was 21 month old son Roland C. Aldrich living there, too. In 1930 Charles and Margaret were still in Seattle where Charles' occupation is listed as being a building contractor. He must have been quite successful as the value of their home on that census was recorded as $75,000. No sisters or step sisters are listed on any of the three censuses I viewed. Hope this helps you! Regards, Steve.