This might be a brother?
Source: "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3DK-GNJ : accessed 21 November 2017), Joseph Govero in household of Matthew Bouchard, Union Township, Washington, Missouri, United States; citing enumeration district (ED) 140, sheet 15A, family 275, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,907.
United States Census, 1900 Union Township, Washington, Missouri
Matthew Bouchard Head M 59 Missouri
Sophia Bouchard Wife F 49 Missouri
William Bouchard Son M 30 Missouri
Henry Bouchard Son M 19 Missouri
Clara Bouchard Daughter F 16 Missouri
Fred Bouchard Son M 14 Missouri
Joseph Govero Adopted son M 7 Missouri