Mary Elizabeth Mahaney was my great x 3 grandmother. I have found very little about her. According to the 1880 census she was from Maryland. She married John Harris Zimmerman. They had 4 children. I am descended from their youngest daughter, Florence Virginia who married Edward Coffman. I have a reference to a sister, Martha Mahaney born about 1847, but that is all the info I have. John Zimmerman remarried and had additional children. I would like to know who Mary Elizabeth's parents were. Did she have other siblings. Any new info would be greatly appreciated. Thanks.