Looking at dathai's links and this family
Edward McROBIE m Susanna SMITH on Mar 16 1854 in Adare, Co. Limerick
He was a gamekeeper
They had at least nine children
1856 Eliza possibly died 1874
1858 Hannah
1860 Edward
1862 Dinah died 1874
1864 Unnamed died 1864
1865 Alexander George
1868 John
1869 Emma Susan
1873 Henry
LINK to irishgenealogy.ie where later births are recorded and some online
Although this family may be related there are no logical births or gaps to imply the children on the 1861 census in Scotland; Jane (bc1857) and Alexander (bc 1859) are part of the same family
they may be cousins
editted to add
Alexander McROBIE m Emily CHEADLE
She is on the 1901 census in Galway
LINKat house 14.4 in Lombard Street (Galway North Urban, Galway)
Alexander George McRobie signed the return
because of this you would expect to find him on a Barracks return (Form H) but I cannot see him