1) Mail to archives@... and ask your questions heading "hidden children".They have a collection about it.

2) Service social juif is still existing. Mail info@.... 

Wish you good luck
--
Françoise KRAFT

searching KRAFT from HRUBIESCHOW (Poland) and ODESSA (Ukraine).   INDIS from ODESSA (Ukraine),BELTSY (Moldova) and  NIKOLAIEV KHMELNITSKY Podolia(Ukraine)