Hi Barbara,
I can't help with any of the descendants, sorry. I do have some of the cemetery and churchyard records for Cambusnethan but, unfortunately, the records for 1902 - 1905 are missing, so I can't check to find out if the child who died is buried in a private plot or in common ground. Perhaps you may know?
I have checked the records and there doesn't seem to be any more interments for children of George & Elizabeth between 1905 and 1917, when my records finish.
What I did find, and it may fill in some gaps in your tree, are six interments for siblings of George, children of James Robertson & Isabella Love. They are all buried in common (public) ground, so there is no memorial and after all this time the exact location has been lost.
All dates are of interment and all are listed as children of James & Isabella.
ROBERT ROBERTSON, Overtown, aged 8 months. 30th October 1861.
STILLBORN MALE ROBERTSON, Wishaw. 12th December 1864.
STILLBORN FEMALE ROBERTSON, Overtown. 22nd August 1870.
STILLBORN FEMALE ROBERTSON, Overtown. 7th March 1874.
STILLBORN MALE ROBERTSON, Overtown. 6th May 1879.
JOHN ROBERTSON, Overtown, aged 5 years. 10th August 1880.
Hope this helps a little,
Lodger