What Happened to My Great Grandfather?

My grandfather, my paternal grandfather, i arrived in england when he was about 11. He came from belgium where his great grandfather had been working on the diamond boss. The details are shrouded in family, youes that kind of thing. I think actually a is take, i mean to go and take a tape recorder and talk to surviving members of the family about what they remember. Their stories always contradict each other. It all got tremendously dark, and in the way that only families can sort of.