I don't know anything about Maria Soentpiet, but I do know that my mothers oldest sister was married to a Soentpiet. They lived in Jakarta but died a few years ago. They had three children two boy's and a girl, Bobby, Gino and Ruth. I lost track of them and the last time I saw them in Indonesia was in 1985. They are still alive and my mother has now and then contact with them. Maybe my mother can be of help to you. Contact me at my e-mail adress.