These pictures were taken in Aberdeen. From L -R . Leslie Burnett b 1870, Twin girls Mary & Maria Reid/Mathieson: both raised as Burnett's by David and their mother Isabella Mathieson Burnett. Bottom left I believe is David and Isabella Burnett. The bottom right says they are Burnett's but I have a guess as to who.
Top left I think are the 4 Burnett brothers that came to America. Their names are James, George, William and Leslie. The young is a nephew I'm told. Top left syas Leslie Burnett on the back. The bottom 2 I haven't a clue.