It's lovely to hear from a family member! My name is Julie Ball and I am the Grand daughter of Margaret Rose De La Fuente. Her father was Abraham De La Fuente who I think shared the same Great great Grandfather as Leonard. I don't have my family tree open at the moment, so I might not have that quite correct. I have found the story of Leonard and his family very touching and spoke about it recently for Holocaust Memorial Day, I work at a library here in the UK. Good luck with your research, if there is anything that I can do to help, please do let me know.
Verhaal