Hello Bev, here is the OTHER William Watterson married, - Louisa.

1910 United States Federal Census about William Watterson
Name: William Watterson
Age in 1910: 47
Birth Year: abt 1863
Birthplace: England
Home in 1910: Proviso, Cook, Illinois
Race: White
Gender: Male
Immigration Year: 1903
Relation to Head of House: Head
Marital status: Married
Spouse's Name: Louisa Watterson

Father's Birthplace: England
Mother's Birthplace: England

Household Members:
William Watterson 47
Louisa Watterson 44
William Watterson 17
George Watterson 16
Janie Watterson 15
Alexander Watterson 11

1920 United States Federal Census
Name: William Watterson
Age: 57
Birth Year: abt 1863
Birthplace: England
Home in 1920: Proviso, Cook, Illinois
Race: White
Gender: Male
Immigration Year: 1903
Relation to Head of House: Head
Marital status: Married
Spouse's Name: Louisa Watterson
Father's Birthplace: England
Mother's Birthplace: England
Home Owned: Own
Able to Read: Yes
Able to Write: Yes

Household Members:
William Watterson 57
Louisa Watterson 54
Jeanie Watterson 24

1930 United States Federal Census
Name: William Watterson
[William Walterson]
Gender: Male
Birth Year: abt 1863
Birthplace: Wales
Race: White
Home in 1930: Maywood, Cook, Illinois
Marital status: Married
Immigration Year: 1903
Relation to Head of House: Head
Spouse's Name: Louisa Watterson
Father's Birthplace: Wales
Mother's Birthplace: Wales

1940 United States Federal Census
Name: William Watterson
Age: 77
Estimated Birth Year: abt 1863
Birthplace: Isle of Man
Marital Status: Widowed
Relation to Head of House: Head
Home in 1940: Piper City, Ford, Illinois
Residence in 1935: Maywood, Cook, Illinois
Citizenship: Naturalized

SON – William Watterson ???

1930 United States Federal Census
Home in 1930: Maywood, Cook, Illinois
Father's Name: William Watterson
Father's Birthplace: England

Household Members:
William Watterson 36
Wilhelmina A Watterson 26
William D Watterson 9
Donald E Watterson 7

1940 United States Federal Census
Name: William Watterson
Home in 1940: Maywood, Cook, Illinois
Street: So 16 Avenue
House Number: 406
Inferred Residence in 1935: Maywood, Cook, Illinois
Residence in 1935: Same Place
Resident on farm in 1935: No
Sheet Number: 9A
Attended School or College: Yes
Highest Grade Completed: High School, 3rd year

Household Members:
Wm Watterson 47
Wilhelmina Watterson 36
William Watterson 19
Donald Watterson 17
Douglas Watterson 74

Averil