I'm a descendant of the Philip Bigley in your list (I think), but it looks like you have way more on Dickson than I do.I notice your message is a few years old, so maybe you already know this but the way I have it is:
There was another brother of Dickson, named Henry Wilkins Bigley, and I'm descended from him.I found some information about Henry in a book at the Pittsburgh library called "History of Allegheny County, Pennsylvania":
Henry Wilkins Bigley, retired, post office Logan's Ferry, was born in Franklin township, this county, in 1832, son of Phillip and Mary (Esteft) Bigley, natives of Clarion county, Pa.The father died about 1867, aged seventy-eight years, and the mother in 1856, aged fifty-one years, both members of the Presbyterian Church.The grandfather of H. W. Bigley was Phillip Bigley.The subject of this sketch received his education at the place of his birth, and at the age of fourteen years sailed on the first iron-clad steamer that left Pittsburgh via the gulf and Red river for the Rocky mountains, carrying provisions to the standing army.He was eight years on the Red river, then returned to Pittsburgh, and ran on the Allegheny and Ohio rivers as pilot, from Pittsburgh to Cincinnati, until 1882, when he retired.He was married, in 1850, to Maria, daughter of Samuel and Catharine (McMillen) Hosick, early settlers in East Deer township.Twelve children have been born to Mr. and Mrs. Bigley, four of whom are living: Samuel Joseph, Viola (Mrs. Oliver Fulton Katz), Isabella (Mrs. William Lyons), and Harry, in Verona.Four of the family died in October, 1877, of diptheria, their names being Flora, Stewart W., Melissa and Foster, aged seventeen, fourteen, twelve and nine years, respectively; four others died under two years of age.Mr. and Mrs. Bigley are members of Alice Cary Lodge, Daughters of Rebekah, of Pittsburgh, and of the Presbyterian Church at Parnassus.Mr. Bigley is a member of teh I. O. O. F. and the republican party.On March 17, 1865, his house and barn, with all their effects, were swept away by the flood, and all was lost save one trunk of clothing.This involved a loss of several thousand dollars, but Mr. Bigley, being a resolute man, began anew, and has since prospered in every business undertaking.