Mary was born about 1860. She is the daughter of Alexander Sellar.
<https://www.findmypast.co.uk/transcript?id=GBC/1861/0022070786>
<https://www.findmypast.co.uk/transcript?id=GBC/1871/0026180283>
<https://www.scotlandspeople.gov.uk/record-results/156241943563e14a9a3c651>