General Notes

Source:  1901 census, living in Letterloan with widowed mother, unmarried at this time. 
1901 Census:
Residents of a house 4 in Letterloan (Letterloan, Londonderry)
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Surname    Forename    Age    Sex    Relation to head    Religion    Birthplace    Occupation    Literacy    Irish Language    Marital Status    Specified Illnesses
Mc Keown    Martha    53    Female    Head of Family    Presbyterian    Co Derry    Farmer's Wife    Read and write    -    Widow    -
Mc Keown    Thomas James    28    Male    Son    Presbyterian    Co Derry    Farmer's Son    Read and write    -    Not Married    -

Still single, unmarried and living with Mummy in 1911, now aged 39. 
1911 Census:
Residents of a house 8 in Letterloan (Letterloan, Londonderry)
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Surname    Forename    Age    Sex    Relation to head    Religion    Birthplace    Occupation    Literacy    Irish Language    Marital Status    Specified Illnesses    Years Married    Children Born    Children Living
Mc Keown    Martha    64    Female    Head of Family    Presbyterian    Co Derry    Farmer    Read and write    -    Widow    -    -    -    -
Mc Keown    Thomas James    39    Male    Son    Presbyterian    Co Derry    Farm Labourer    Read and write    -    Single    -

Signed the Ulster Covenant in 1912 giving address as Letterloan, Macosquin.