I realize this is an old thread but I'm looking for the same info as the OP. So many family trees have Christopher Askin, or Erskine (and his brother Robert) as the son(s) of Lord Erskine, Earl of Grange. And that these two brothers fled Scotland after the 1715 uprising and came to the colonies. It's neat and easy and it has the added benefit of connecting the Erskine lineage to virtually all the kings and queens of Scotland, England, and medieval England, back to Alfred the Great. From Earl of Grange there are direct lines to most of these monarchs.
But I don't think it makes sense and am happy to explain, but I'm not sure if this thread is still getting traffic, so will wait for a reply. Wondering if anyone has come up with an alternate parentage for the Christopher and Robert Askin that came to the colonies in the 1720s?