1850 Shelby Co, OH: John Burnham 72 Massachusetts; Daniel 21 Ohio; Eliza J. 22 Ohio; Mary J. 15 Ohio; Curtis Burnham 61 NH (Greene, p. 191, 10/17/1850)
Curtis born 1786 is the only Curtis Burnham born in the 1780s/90s in New Hampshire to which any reference appears on FamilySearch, Ancestry, WorldConnect, or Google. No known reference indicates what happened to him, but 1) the parents Johan and Sarah are typically (although without source) listed as dying in Ohio; 2) Curtis b. 1786 had a brother John born Dec. 1776 born in Massachusetts, which fits almost with the 1850 record. For additional discussion on the identify of this John, see this page.