From Genealogical and Personal History of Western Pennsylvania:
Mr. Taylor married, October 31, 1883, Lillian, daughter of the late
Robert and Elizabeth (Riggs) Pitcairn, of Pittsburgh.
From History of Allegheny County, Pennsylvania:
(Robert Pitcairn) July 26, 1856, he was married to Miss
Elizabeth E., daughter of John Rigg, a resident
of Altoona, formerly of Lewiston, Pa.,
and of this marriage there have been born
three daughters and one son.
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZLZ-XV4 : 17 October 2014), Elizabeth Pitcairn in household of Robert Pitcairn, Pennsylvania, United States; citing p. 49, family 361, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,797.
"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MS15-4Q8 : accessed 20 May 2015), Elizabeth E. R. Pitcairn in household of Robert Pitcairn Sr., Precinct 8 Pittsburgh city Ward 20, Allegheny, Pennsylvania, United States; citing sheet 4A, family 49, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,362.