Margaret and her sister Sara came from came from the townland of Derrydrummuck near Loughbrickland in Co. Down. This townland is to be found east of the B3 road between Loughbrickland and Rathfriland. Their father, Robert Herdman, was a farmer.
Margaret and Thomas Harland were married in Loughbrickland Presbyterian Church on 29 Sept. 1852. They had four children, but only two of them reached adulthood - John (1854) and Mary (“Minnie”) (1857). Minnie died from pulmonary tuberculosis in 1878. She was said to have been very much loved by her brother John.
There is no information as to why Robert (1855 – 1861) died so soon after his mother, but we know that he was buried in the family grave at Mullaghglass Old Graveyard. Thomas and Margaret’s youngest child, Agnes Isabella Wallace Harland, who was born on 24 January 1860, was also buried there having died in early infancy. Her baptismal record is in Newry Methodist Church. It seems likely that Margaret died in childbirth, but the records are incomplete.