Looking for information on the parentage of Frederick and Thomas Stevenson, brothers who married Elizabeth and Nancy Benninghoff respectively, daughters of Frederick Benninghoff from Center Twp. Frederick b. ca 1802 in MD or PA and Thomas b. 1805 in PA. Marriages occurred in 1820's and then the boys appear in Venango Co. with their wives and father-in-law Frederick Benninghoff by 1830's. Would appreciate any info that anyone may have come across concerning them. Thanks.