Brice Thomas - Marrying cousins

My 7th great grandparents @Brice Thomas and @Anne Thomas (Alexandre) had two daughters likely twins born 1705: @Marie Anne Gilson (Thomas) and @Anne Marie Pierson (Thomas). The twins had children, first cousins: @Marie Anne Gilson (Thomas) was the mother of @Louis Ghislain Gilson, while @Anne Marie Pierson (Thomas) was the mother to @Marie Anne Gilson (Pierson). These first cousins were married and had seven children, the fifth was @Marie Therese Denis (Gilson), my fourth great grandmother.