Thanks, Frances.
Actually I am seeking a wing and prayer response from a live body who not only knows they are related to Edward Gelling who died almost 100 years ago, but also knows of Edward's siblings besides Charlotte and the second John who I know of already. However! I did not catch the H Mudie Draper bit on the Manxnotebook site AND, I hadn't caught the fact that Edward appers in Lawson's burial index and his will index AND Edward's father appears to be in Lawson's will index. And now I see that Edith Julia appears in the marriage index as well.

But other than that, and who knows what else. I have done a really thorough search of the existing "literature".