You do not state where the Wademan family are from So is this your mother's marriage. If so what/who are you looking for?

Marriage
Name: Earl Cottrell
Event Type: Marriage
Event Date: 23 Dec 1939
Event Place: Lackawanna, Pennsylvania, United States
Age: 27
Birth Year (Estimated): 1912
Father's Name: Charles Cottrell
Mother's Name: Olive Ferris
Spouse's Name: Juanita Wademan
Spouse's Birth Year (Estimated): 1917
Spouse's Father's Name: Herbert Wademan
Spouse's Mother's Name: Clara Hobbs

Reference ID: No. 2779 p 279 , GS Film Number: 2313429 , Digital Folder Number: 004480796 , Image Number: 00447

This looks like Juanita in the census before her marriage, her mother is a Widow

United States Census, 1930
Name: Juanita G Wademan
Event Type: Census
Event Year: 1930
Event Place: Ararat, Susquehanna, Pennsylvania, United States
Gender: Female
Age: 12
Marital Status: Single
Race: White
Race (Original): White
Relationship to Head of Household: Daughter
Relationship to Head of Household (Original): Daughter
Birth Year (Estimated): 1918
Birthplace: Pennsylvania
Father's Birthplace: Pennsylvania
Mother's Birthplace: Pennsylvania

Clara E Wademan Head F 36 Pennsylvania
Nelson W Wademan Son M 16 Pennsylvania
Juanita G Wademan Daughter F 12 Pennsylvania
Clifton H Wademan Son M 2 Pennsylvania
District: 0002 , Sheet Number and Letter: 4B , Household ID: 91 , Line Number: 73 , Affiliate

Name: The U.S. National Archives and Records Administration (NARA) , Affiliate Publication Number: T626 , Affiliate Film Number: 2151 , GS Film number: 2341885 , Digital Folder Number: 004639488 , Image Number: 00018

Death
Name: Earl Cottrell
Gender: Male
Race: White
Age: 51
Birth Date: 27 Nov 1912
Birth Place: Ararat Township, Pennsylvania
Death Date: 29 Dec 1963
Death Place: Ararat, Susquehanna, Pennsylvania, USA
Father Name: Charles Cottrell
Mother Name: Olive Farris
Spouse Name: Juanita Wademan Cottrell
Certificate Number: 124862-63

United States Census, 1920
Name: Clara E Wademan
Event Type: Census
Event Year: 1920
Event Place: Ararat, Susquehanna, Pennsylvania, United States
Gender: Female
Age: 25
Marital Status: Married
Race: White
Race (Original): White
Can Read: Yes
Can Write: Yes
Relationship to Head of Household: Stepdaughter-in-law
Relationship to Head of Household (Original): Stepdaughter-in-law
Birth Year (Estimated): 1895
Birthplace: Pennsylvania
Father's Birthplace: Pennsylvania
Mother's Birthplace: Pennsylvania

Richard B Wademan Head M 62 Pennsylvania
Jennie M Wademan Wife F 50 New York
Herbert C Wademan Stepson M 27 Pennsylvania
Clara E Wademan Stepdaughter-in-law F 25 Pennsylvania
Nelson W Wademan Step-granddaughter M 5 Pennsylvania
Wanetia G Wademan Step-granddaughter F 2 Pennsylvania ** Juanita ?
Emma L Stalker Aunt F 63 New York

District: 60 , Sheet Number and Letter: 10A , Household ID: 58 , Line Number: 36 , Affiliate Name: The U.S. National Archives and Records Administration (NARA) , Affiliate Publication Number: T625 , GS Film number: 1821655 , Digital Folder Number: 004384849 , Image Number: 00048

I will look further when you confirm this is the correct family. From the above it would appear that Herbert took the Name Wademan when his mother remarried