Douglas and Fisher

[Tariana]

I'm looking for any information on John Thomas Fisher and his wifre, Mary (Douglas) Fisher. They had a son, Robert Fisher, born in Maryland, USA.
I had the 1880 US census info on John and Mary.

Name:    John FISHER
Age:    56
Estimated birth year:    <1824>
Birthplace:    Scotland
Occupation:    Mining Laborer
Relationship to head-of-household:    Self
Home in 1880:    Lonaconing, Allegany, Maryland
Marital status:    Married
Race:    White
Gender:    Male
Spouse's name:    Mary FISHER
Father's birthplace:    Scotland
Mother's birthplace:    Scotland

Name:    Mary FISHER
Age:    51
Estimated birth year:    <1829>
Birthplace:    Scotland
Occupation:    Keeping House
Relationship to head-of-household:    Wife
Home in 1880:    Lonaconing, Allegany, Maryland
Marital status:    Married
Race:    White
Gender:    Female
Spouse's name:    John FISHER
Father's birthplace:    Scotland
Mother's birthplace:    Scotland