Here are the children and parentage info I have on George and Margaret. Any further information / clues would be welcome!

George Robb (son of Alexander Robb & Barbara Gray)
Margaret Robertson (dau. of Robert Robertson & Isabella Gray)

Descendants of George Robb

1 George Robb b: Abt. 1839 d: 01 Jan 1872 in Aberdeen Cause of death: fractured ribs, rupture of liver & spleen 1 month, pleurisy w/infusion 1 month Occupation: labourer
.. +Margaret Robertson b: Abt. 1840 m: 09 Feb 1861 in Middtown, Bontriphinie, Banffshire Occupation: domestic servant
........ 2 George Robb b: 02 May 1863
........ 2 Robert Robertson Robb b: 21 May 1865
........ 2 Joan Smith Robb b: 20 Nov 1867
........ 2 Charles Middleton Robb b: 07 Jan 1870 in Aberdeen Scotland d: 06 Jan 1939 in Brooklyn, N.Y.,Buried ,Maplegrove Cem., Hollis,N.Y.
............ +Elizabeth Black b: 06 Sep 1875 in Aberdeen Scotland d: 09 Mar 1931 in Brklyn, N.Y.,Buried, Maplegrove Cem., Hollis N.Y.
........ 2 Alexander Robb b: 11 May 1872
Thank you,
Marsha Robb Devine (USA)
marsha.devine@verizon.net