**I am not related.

I found the family in the 1920 census:

Source Citation: Year: 1920;
Census Place: Wilton, McLean, North Dakota
Roll: T625_1336; Page: 5B; Enumeration District: 117

John W Black 46
Hulda C Black 40
Evelyn J Black 16
James A Black 11
Jonathan P Black 8
Leonard A Black 6
Floyd C Black 4 8/12
Naomi E Black 6/12

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The 1930 Census shows him living as a Lodger:

Source Citation: Year: 1930
Census Place: Hahnaman, Whiteside, Illinois
Roll: 566; Page: 3B; Enumeration District: 0015

James A Price 53
Ada E Price 53
Leonard A Black 16

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The 1940 Census shows him in the Army and stationed in Detroit, MI.
Source Citation: Year: 1940
Census Place: Detroit, Wayne, Michigan
Roll: T627_1874; Page: 3A; Enumeration District: 84-1128

Name: Leonard A Black
Age: 26
Estimated birth year: abt 1914
Gender: Male
Race: White
Birthplace: North Dakota
Marital Status: Single
Relation to Head of House: Soldier
Home in 1940: Detroit, Wayne, Michigan
Residence in 1935: Beach, North Dakota
Resident on farm in 1935: No
Institution: Fort Wayne US Army Post
Occupation: Pharmacist
Attended College: No
Highest Grade Completed: Elementary school, 8th grade
Hours Worked Week Prior to Census: 40
Class of Worker: Wage or salary worker in Government work
Weeks Worked in 1939: 52
Income: 960
Income Other Sources: No