After receiving very helpful clues from several Genners( I thanked them directly) and reviewing my DB I established that Liba/Libby KONIGSBUCH is actually Liebe Reisel KONIGSBUCH
born Brzesko in 1914 to Dobe FEILGUT and Aron KOENIGSBUCH. She is actually my late mother's second cousin. So I have another branch in the USA.
Liba has a son called Arnold Gottfried (b. 1947) in New York who lives probably in the Bronx. Alas, his phone # and email address as they appear on MyHeritage and other websites are defunct.
Please help me to contact Arnold, my newly discovered 3rd cousin. Please answer privately.