Here are a couple of entries from the 1881 Census for Edinburgh.

St Cuthberts, Edinburgh

49A Brunswick Street

Alexander Chillas   age 28  Head Warehouseman born Old Meldrum

Isabella Chillas       age 4    Niece

Margaret Chillas      age 33 Sister Domestic Servant     Old Meldrum

William Chillas        age 26 Brother  Cabinet Maker's Porter  Kintore

This is Alexander Chillas b. 1852, William b. 1854 and Margaret Davie Chillas b. 1848 to James Chillas and Margaret Hardie. I assume Isabella was a daughter to Margaret Chillas, b 1897 Drumoak. Margaret went on to marry George Begg in 1889 in Drumoak. I assume that this odd combination of people moved to Edinburgh for work.