There is only one Helen Bair that shows up in the Lycoming county census of 1920: Household Gender Age Birthplace SELFWesley BairM 46y Pennsylvania WIFELaura BairF 39y Pennsylvania DAUHelen BairF 16y Pennsylvania SONWilliam BairM 15y Pennsylvania SONCleon BairM 14y Pennsylvania The sensus record is here: https://familysearch.org/pal:/MM9.1.1/MF19-Z8C
The family does not appear in the 1910 census.By 1930, only Cleon is living with his parents, and by 1940 Wesley and Laura are living alone in Williamsport.
1930 census of Williamsport, Lycoming, Pennsylvania: Household Gender Age Birthplace HeadWesley BairM 54 Pennsylvania WifeLaura BairF 49 Pennsylvania SonCleon BairM 25 Pennsylvania Daughter-in-lawMargaret BairF 25 Pennsylvania GrandsonWilliam BairM 2 Pennsylvania GranddaughterLois BairF 1 Pennsylvania 1930 census record:https://familysearch.org/pal:/MM9.1.1/XHCJ-JJ8
1940 census record of Ward 10, Williamsport, Williamsport City, Lycoming, Pennsylvania: Household Gender Age Birthplace HeadWesley BairM 67 Pennsylvania WifeLaura BairF 59 Pennsylvania 1940 census record:https://familysearch.org/pal:/MM9.1.1/KQNS-MW3
Working backwards, Wesley is living with his brother's family in the 1900 census of ED 91 Williamsport city Ward 8, Lycoming, Pennsylvania: Household Gender Age Birthplace HeadHarry BairM 31 Pennsylvania WifeMinnie S BairF 25 Pennsylvania SonRaymond C BairM 9 Pennsylvania BrotherWesley BairM 27 Pennsylvania SisterCarrie M BairF 20 Pennsylvania Brother-in-lawFreeman HaukeM 13 Pennsylvania 1900 census record:https://familysearch.org/pal:/MM9.1.1/M3Q8-TN8
1880 census of Washington, Lycoming, Pennsylvania: Household Gender Age Birthplace SELFIsaac BairM 32 Pennsylvania, United States WIFEBelle BairF 26 Pennsylvania, United States SONHarry BairM 10 Pennsylvania, United States SONWesley BairM 6 Pennsylvania, United States DAUMay BairF 4M Pennsylvania, United States NIECE Agnes BairF 12 Pennsylvania, United States The 1880 census record is here: https://familysearch.org/pal:/MM9.1.1/MWN6-9MS