Besides Gertrude Doors NOT being married to her own son Johannes Kuster, she is not the mother of an Abigail Browning, or a Charity Custer Humbell. Gertrude's marriage to Paulus Kuster is well documented, as is her children. Some further correct research needs to be done, if your wanting to find a parent for your Abigail Browning and Charity Custer Humbell .... Gertrude Doors married to the correct husband Paulus Kuster is not the parents, and for sure Gertrude Doors married to her own son Johannes Kuster are not the parents.