I'm 22 and live in Australia. My grandmother's maiden name was Haak. Her name was Lotte Haak before she married into the surname Pfeifer. She had five siblings that I know of, Betty, Frieda, Max, Erich and one more brother whose name isn't known at the moment. The were all born around the turn of last century (around 1900-1925). Their Parents were Christian and Martha Haak. I don't know Martha's maiden name but I know she had a brother called Karl. They all originated from the Hamburg region in Germany. Does your Dad know of any other Haak connections? That is all the info I have at the moment.