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No, sorry. This Isaac is well documented in pension records to be married to Mary, and had kids Abraham, Lucinda (married David Beatty), Jacob (left home around War of 1812 and never heard of again), Simeon (died around War of 1812 at age 22, married to Debora), Andrew (died in War of 1812), Elizabeth (married Thomas Alexander), John (died in infancy).
I had posted several messages on the "other spellings of Updegraph" forums and someone contacted me looking for Casper there, I think recently. If you haven't read those message, look them up. The forum spellings might be Uptegraft and Updegraff.