Manhattan marriage certificate #7347 records the marriage of Elizabeth Cornell and Martin H Roberts on 19 Dec 1878. The IGI has a record of this marriage, and gives the parents of Martin as William C Roberts & Matilda Hoffman.
The 1892 NY Census listing includes William C. Roberts, age 20, a child of his first marriage, as well as EC (Cornell) and her children with Martin.
"New York State Census, 1892," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X3XH-BYB : accessed 1 December 2015), Martin H Roberts, 1892; citing , Flushing, , 03, Queens, New York, county offices, New York; FHL microfilm 1,976,730.
"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:248M-PSK : accessed 30 November 2015), Martin H. Roberts and Clara F. Griffin, 08 Mar 1865; citing Marriage, Manhattan, New York, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,671,674.
"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:249Y-N29 : accessed 30 November 2015), Martin Roberts and Elizabeth Cornell, 19 Dec 1878; citing Marriage, Manhattan, New York, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,562,320.
"New York, New York City Municipal Deaths, 1795-1949," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2WQ3-LQR : accessed 1 December 2015), Martin H Roberts, 30 Jan 1913; citing Death, New York City, Queens, New York, United States, New York Municipal Archives, New York; FHL microfilm 1,323,432.
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Found the proof we needed - William C. Roberts b. 1871 is listed with his father's second family in the 1892 NY State Census in Flushing, Queens. Please okay this merge. Thanks, Nanette