His name was Christ Visnuevo, the stepson of his ethnic Mexican wife, Eugiruia.
As the given names Juan and Nagario suggest, these "black" men themselves had ethnic Mexican mothers and thus represented a second generation of racially blended families.
Interracial families were often what would today be called blended families since both husband and wife brought children from previous marriages into the new households.
Juan Singletary of Hidalgo County had two stepsons, Ballagar and Davie Solis, living with him.
Louis Rutledge was a black male born in Alabama who lived in the county's Second Precinct in 1900.
In 1886, he married Angle, an ethnic Mexican woman who was born to Mexican parents.
In 1900, Juan Zuniga’s daughter, Redacinde Jackson, lost her black husband.
She then returned with her children to her father’s home.
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Both were sons of Antonia, his ethnic Mexican wife.
Nagario Jackson also had a stepson living in his household.
In the article below historian Alberto Rodriquez describes that process. According to that census, 177 blacks formed 18 households in Cameron County.
Of those eighteen households, seven or 38% were interracially married.