Thank you this gets us started in the right direction
I think Frank nailed it, but here it is (again) - dang you are FAST on the keyboard, Frank
Oscar Branch in household of Daniel M Branch, "United States Census, 1850" — FamilySearch.org
Oscar B Branch in household of Daniel Branch, "United States Census, 1860" — FamilySearch.org
Oscar B Branch, "Find A Grave Index" — FamilySearch.org
Father (/I think) Daniel H Branch Jr (1809–1887) | Person | Family Tree | FamilySearch
Daniel H Branch Jr (1809–1887) | Person | Family Tree | FamilySearch [sources]
paternal grandmother I think Anna Bromley (1781-1869) • FamilySearch and at Anna (Bromley) Branch (1781-1869) | WikiTree FREE Family Tree
Hot diggity, paternal grandfather Liberty Branch Sr (1777-1857) | WikiTree FREE Family Tree
There is what seems to be a lot more info online but this connects him to the big tree?
Death record, military, Civil War Round Table - SLCHA
Whitford, James W.; Co. A
more military Civil War Collections: Manuscripts and Special Collections: New York State Library
Source: "United States General Index to Pension Files, 1861-1934", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KDP1-7JR : 13 March 2018), Oscar B Branch, 1877. IMAGE https://www.familysearch.org/ark:/61903/3:1:33SQ-GTRP-ST3?i=856&cc=1919699&personaUrl=%2Fark%3A%2F61903%2F1%3A1%3AKDP1-7JR United States General Index to Pension Files : Oscar B Branch : Service H 106 NY Inf : Date Apr 3, 1877 : Beneficiary (Mother) Nancy A Branch : Date June 6, 1886 Beneficiary (Father) Daniel H Branch
From sister's marriage it looks like his mother may be Nancy Wilbur.
Source: "New York Marriages, 1686-1980", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F63H-KB3 : 21 January 2020), Carrie A. Brauch in entry for George Green, 1888. New York Marriages : George Green : Male Age 46 Birth 1842 : Father Braddock Green Mother Pamelia Haskins : Marriage 24 Oct 1888 Lawrence, St. Lawrence, New York : Spouse Carrie A Branch : Female Age 38 Birth 1850 : Father Daniel Brauch Mother Nancy Wilbur