Your Isaac Brown was probably the son of Isaac and Elizabeth Millet Brown who were in Deerfield Mass. Isaac and Elizabeth's daughter Mehitabel married Joshua Blanchard. I see that your Phoebe Brown married William Jones. Joshua's son Nehemiah married Lucy Jones in Buckland MA. The Blanchards and the Browns went to Guilford about the same time. I've been trying to find Lucy's parents. Unfortunately neither the weatern half of Massachusetts, nor Vermont have been very forthcoming with online access to records, so it makes it difficult.