Searching for family in the Netherlands Mulder in rotterdam,Van asperen in rotterdam,Brostrom and synder in Amsterdam. My grandmother Wilhelmina Mulder married Frank Brostrom in Amsterdam. She was born in rotterdam. Mother was Paulina Van Aspreren who was married to a Mulder.Frank Brostrom was the son of Cathrine Synder and Aldolf Brostrom. Please help if you have any information.