A big thanks to Frank Speckmann, for the information provided. It has been a big help.
Is there any chance that you can discover the names of the siblings that you mentioned of Maria Catharine Gerdes, Maria Wempe and Johann Hinrich Wempe.
Regarding Marie Wempe, unfortunately I dont know much about what happened to her, I have a transcript of her birth/baptism record from the church passed down through the family and have been told by an Aunt that she had a daughter Anna Catrina Wempe who was my great grandmother. I havent been able to determine how Anna came to have the same surname as her mother, or any details of the father. Anna Catrina Wempe raised a family in city of Oldenburg. Unfortunately the whereabouts of Marie Wempe and what became of her are unknown.
Tania Taylor