Hi Sandra,
Yes, that is any descendants of Isabella out of the picture. Which leaves us with 4 children to pursue. I have been looking at them and will post my findings. The unfortunate thing is, as you will already be aware of, is a follows - Not available online - Births less than 100 years, Marriages less than 75 years and Deaths less than 50 years.
The next Child of James Greenan is James Greenan born 3/2/1907. He married Annie Cairns on 4/4/1936 and died on 17/12/1950 at 24 Pipe Street, Portobello, Edinburgh. His death was registered by his widow Annie. Annie died in 1998 so no way of knowing who registered her death. There are a number of possible children of this marriage in the SP Index but no way of knowing who they were.
Dorrie