Francois Pitre was born about 1920. He does not appear in the census listing for Moise and Ola (Alla) in 1920, so would have been born later in the year. 
He appears in the 1930 census in Ville Platte, Evangeline, Louisiana, United States with his whole family: Moise Alla (Ola) and their children, Austin, Evline, Hurschel, Francois, George and Rose. 
In the 1940 census, he appears, as Frank instead of Francois, with his whole family in the same house as in 1930. There are three additional children: Wilfred (10), Mae Monia (8) and Anne Patsy (1). 
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MVQG-JRB : 14 December 2015), Moise Pitre, Police Jury Ward 1, Evangeline, Louisiana, United States; citing sheet 21B, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,612.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VYTM-5ZD : accessed 5 October 2016), Moise Petre, Ville Platte, Police Jury Ward 1, Evangeline, Louisiana, United States; citing enumeration district (ED) 20-1, sheet 5A, family 95, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1400.