Yes! Dr. Joseph Riggs & Ann Canfield were Arena's parents. Arena married Samuel Bradley. When Dr. Joseph Riggs died, his widow, Ann, married Samuel Bradley's widowed father, Abner Bradley. So Samuel & Arena were husband & wife and then step siblings! Dr. Joseph Riggs' father was Deacon Ebenezer Riggs and the line matches the one you show, back to Sergeant Edward Riggs, b. 1609.
Thank you for the puzzle pieces. Teri Bradley Barlis