Does anyone know if Isaac Blackmore from Mass. who lived in PA., was related to Sarah Blackmore Sears from Mass. as well. I think they both livedaround the same time frame in the mid to late 1700's. I found on LDS online someone has done extensive ancestry research for Issac Blackmore, connecting him through his mother(or his grandmother) Mercy Sears Blackmore to the Howard family of England and to the Plantagenets. Sarah Blackmore Sears had a son named Caleb. And I wonder if Sarah had a brother named Caleb Blackmore.