I Am an Granddaughter of Martin Lamp Born IN Germany Died During World War 2

I am an grand daughter of Martin Lamp born in Germany who died during the world war 2,he married and lived in croatia his child Nevenka Lamp born 15/12/1930 in Zagreb Croatia she is my mother born in Croatia now living in Australia. I would like to trace this family so I could get to know a bit more about them and where I come from my background, I belive that he could have been a Jewish by religion.