I have a William ALLEN born @ 1785. Among his sons are John S ALLEN born @ 1839.Reported to have served in the Civil War and married to an Emiline JACKSON. Another son was another William ALLEN born @ 1839. In 1861 he married a Nancy JACKSON in what is now if not then West Virginia. They settled and raised a family in Pike County Ky.This William ALLEN and his family can be found in the 1870 and 1880 Pike Census. Is this a case of brothers marrying sisters? I have been unable to trace the parentage of either Emeline or Nancy. I would be interested if anyone could shed some light for me.