It's a long shot, but have you traced the siblings forward to see if any of them went to Scotland?
Also, if the child of Isaac and Jane isn't yours, then what happened to him? This is something you need to consider. Trouble is, it only proves anything if you find the son of Isaac and jane isn't your chap, whereas it's no proof if you can't find an alternative individual, as he might have emigrated, or whatever, and there might be no record of this.
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 Merry
"Something has been filled in that I didn't know was blank" Matthew Broderick WDYTYA? March 2010
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