If you start at Isabelle (born 1503) to her mother Blanche (born 1578 which is 74 years after Isabelle) to her father Lawrence (born 1540) to his father Thomas (born 1529) to his father Lawrence (born 1479-1501) to his wife Isabella (born 1503) you are back at go. Please break this loop and get the line correct. I think the problem is with Isabelle being Blanche's daughter.
