His mother's name was Annie Hoyle. She was married to Robert Forrest Johnson, she died shortly after child birth. Robert Johnson remarried a Virginia Davis and they raised Forrest Hoyle Johnson.
Forrest H Johnson, United States Census, 1920
Name: Forrest H Johnson
Event Type: Census
Event Year: 1920
Event Place: Upper Darby, Delaware, Pennsylvania, United States
Gender: Male
Age: 18
Marital Status: Single
Race: White
Race (Original): White
Can Read: Yes
Can Write: Yes
Relationship to Head of Household: Son
Relationship to Head of Household (Original): Son
Birth Year (Estimated): 1902
Birthplace: Pennsylvania
Father's Birthplace: Pennsylvania
Mother's Birthplace: Maryland
Household Role Gender Age Birthplace
Robert F Johnson Head M 49 Pennsylvania
Virginia D Johnson Wife F 44 Maryland
Forrest H Johnson Son M 18 Pennsylvania
Jesse Davis Brother-in-law M 46 Maryland

Forrest H Johnson, United States Census, 1930
Name: Forrest H Johnson
Event Type: Census
Event Year: 1930
Event Place: Upper Darby, Delaware, Pennsylvania, United States
Gender: Male
Age: 28
Marital Status: Married
Race: White
Race (Original): White
Relationship to Head of Household: Head
Relationship to Head of Household (Original): Head
Birth Year (Estimated): 1902
Birthplace: Pennsylvania
Father's Birthplace: Pennsylvania
Mother's Birthplace: England
Household Role Gender Age Birthplace
Forrest H Johnson Head M 28 Pennsylvania
Mary M Johnson Wife F 26 Pennsylvania

Forrest Johnson, United States Census, 1940
Name: Forrest Johnson
Event Type: Census
Event Date: 1940
Event Place: Upper Darby Township, Delaware, Pennsylvania, United States
Gender: Male
Age: 38
Marital Status: Married
Race (Original): White
Race: White
Relationship to Head of Household (Original): Head
Relationship to Head of Household: Head
Birthplace: Pennsylvania
Birth Year (Estimated): 1902
Last Place of Residence: Same Place
Household Role Gender Age Birthplace
Forrest Johnson Head M 38 Pennsylvania
Mary Johnson Wife F 36 Pennsylvania
Robert Johnson Son M 8 Pennsylvania
Virginia Johnson Daughter F 6 Pennsylvania
Mabel Mcclinton Mother F 62 Ohio