Henriette Ilse Friederike Dorothee von Bülow - Wrong parents wrong siblins

Marie Amelie Charlotte Ottilie von Arnswaldt are a sister of Friedrich Hennecke and Dietrich Eberhard. O.K.?

No, Friedrich Hennecke and Dietrich Eberhard have no sisters. Only a younger half brother Detlev Werner. Dietrich Eberhard is also still alive, at least he was still alive in 2013 to announce his mother's death to us. We haven't heard any death news about him, since. Even if they had forgotten to tell us, it should have been published in Deutsches Adelsblatt, if so, and it did not. So I wonder who told you he died in 2009. The mother of the three is my father's cousin, Friedrich Hennecke, who passed away in 2012, was my Godfather.

It can be that this Henriette Ilse Friedrike Dorothee belongs one generation earlier and was a sister of the fathers of the three. Hennecke Dietrich Joachim Hermann fathered Friedrich Hennecke and Dietrich Eberhard, Friedrich Werner Wilhelm Ulrich August fathered Detlev Werner, all from the same mother. Hennecke Dietrich and Friedrich Werner had two sisters one of them named Marie Amelie Charlotte Ottilie, so the other could be well Henriette.