It appears that Thomas Williamson died without a will, but did leave administrative papers.....have you ordered a set from Archives and Records? One never knows what they'll find on adm papers.....I once ordered as set, hoping to find the children's names, and did...they were adults and all signed the papers, that they agreed with the court. WILLIAMSON, THOMAS. Thornbury. September 16, 1771. Adm. to Geo. Eavenson and Thos. Bishop. from THE HISTORY OF CHESTER COUNTY PA, by Futhey and Cope; Thomas Williamson and wife Ann Malin, had children, among them, a daughter named Mary...unfortunately there is no mention of who she married.. Daniel Jr who married Hannah Malin, ws born in 1688..... F&C also say that George Eavenson, son of Joseph and Catharine, married Mary Williams....not Williamson...he died 4-30-1816 and his widow 7-7-1828, over 100 years.