Jonathan Heller:
Gerhard's twin brother was named Fritz. After moving to England, Fritz took the additional name Peter. Fritz Peter Heller married Ruth Cohn from Berlin in 1944 and they had a son, Jonathan Heller.
Addition
Jonathan Heller:
Gerhard's twin brother was named Fritz. After moving to England, Fritz took the additional name Peter. Fritz Peter Heller married Ruth Cohn from Berlin in 1944 and they had a son, Jonathan Heller.