Hi Chris
I did some research on this family awhile ago. Jane Keig marr Thomas Radcliffe ( I am researching the Radcliffes of Andreas). I also had no luck finding info William, Thomas or John. I put a transcription of Wm Keig's will on Brian Lawson's wweb site which has been transferred to the IOMFHS site. As of 1850 all seven sons survived Wm. Benjamin died in Nov 1850. would you be willign to share what you have on the other sons. contact me at crgri870 at aol dot com.
Carol