Hi Ron! I feel your pain!
I have a few suggestions (please don't mind - you might have done all these things already!)
1) Re-read that long will for any mention of brothers, sisters, nieces, nephews etc. If there are any, work out the relationship. Something might turn up.
2) Likewise, sketch out a few past generations for everyone mentioned in the will - sons-in-law, executors, etc. Often they have a distant relationship, and (less often, but it happens) looking at the data and running searches from their perspective reveals something about the family of your actual target.
3) See if you can find some Y-DNA descendants, and see if that opens any doors.
Cheers
Shirlea