Dear Ronald,
I found your post on JoodsMonument after searching for my uncle, Psachia Majnchemer, and finding his name on the Auschwitz death list.
My father was Abraham Chaim Majnchemer (naturalised in UK under the name Alfred Charles Mann), who was Psachia's younger brother.
I would be very interested to hear from you. Are you living in Netherlands? I have some, but relatively little, knowledge of what happened to the wider family and have met up with a couple of first cousins over the last decade (Maurice Rotkern in LA and Hershel (Tzvee) Zawlodaver in UK).
If you would like to get in touch I would be delighted to hear from you. My email address is: drnickmann@gmail.com
With best wishes,
Nick