searching a Herbert koster

I am writing because I want to some information about Obergefr Herbert koster or Herbert koster I believe that I knew him, but I was very child.
He has got a old sister or old cousin named Joscelyne, the name maybe I don´t remember well, He lived in Brighton, for me is very important

Now I live in Perú but I often remember this boy. For my is very difficult is writting in English my native languague is Spanish I live in lima and I haven´t information about people of the second world war but I found this forum and I decide write for help me

Can yours put a photograph him? or send me this photography a my mail mendomaren@yahoo.com

Sorry for my mistakes in grammar. I think that Herbert is died now, but I wish found him.

Thanks and kisses
Maren