Looking for Family of Grassinger of Philadelphia

I am looking for all and any information on the following Grassinger family in Philly: Joseph Max Grassinger (1830-1897) and wife, Gertrude (Muth). (1830-1900)

They had two children: .Joseph Max Grassinger, jr. b: 1853, who married Francis Hougate b: 1850
.Martin Grassinger 1856-1919, whose first marriage was to Mary Cressey. (1850-1908) His second marriage was to Elizabeth Young. They moved to NYC and had four children. Martin Grassinger changed his name to David Martin. (He was married to the two women at the same time...bigamist)

I am interested in all and any of the Grassingers of Philly and their descendants.