The sister Margaret lived with was Anne BENDER.
In 1850 they are in Portage, St. Joseph, IN:
Jacob E. Bender 33 PA, Ann 30 OH, Wilson S. 8 OH, David A. 6 OH, Mary Ellen 4 OH, Flora Isabella 2 OH, Margrette 26 OH.
In 1860 the Benders are in Bell Creek, Washington, Nebraska Territory: Jacob E. 43, Anne 39, Almon (David A) 17, Mary E. 14, Flora 12, Charles 9 IN, Clara 7 IN.
Wilson Bender stayed in South Bend but by 1870 he had married Lizzie. They and son Ellwood (b Feb 1870) lived in Reno, Washoe, NV. Wilson was a railroad agent, too, and his cook became David's cook in 1880.
In 1870 Anne Bender and her daughter Clara lived with Anna's son and his family in Sacramento, CA:
D. A. Bender 2, Emma E. 26 bp NY, Ella M. 3/12, Ann 50, Clara 17 and Jim HING 14 bp Canton, China.
In 1880, the Benders, less Clara are in Carson City, Ormsby, NV:
self, David A. 37 OH PA PA, general frgt and pass agt-V & T railroad
wife, Eva E., 36, NY NY NY, keeps house
dau, Ella M., 10, CA CA NY
dau, Elizabeth, 8, NV OH NY
son, Ralph, 4, NV OH NY
mother, Anna L., 60, OH NY NY, housekeeper
servant, Matilda PETERSON, 26, Sweden SW SW
cook, Ah TOON, 28, China CH CH
bdr, Adam WRIGHT, 28, Canada England England, lumberman
The railroad David worked for was the Virginia & Truckee, later known as the Carson and Colorado Railroad.