I have just started researching my grandmother's family and Rieker is the surname of her mother, Wilhelmina. She came to the US from Germany in Aug 1883 with her brother, Ludwig (Louis) and her soon to be husband Gottlob Beyer on a ship called the Suevia. I found the three of them on the passenger list. She and Gottlob lived in Dutchess County NY. In 1900, Wilhelmina's mother, Johanna was living with her and in 1910, Johanna was living with Louis and his family. Not sure if this is the same family, but thought I would reply just in case.
Jane Hubbard Moretti