I am a descendant of Konrad Victor Ising (my grandfather), who's sister's name was Dorothea. His father was Walter Ising and his mother's Frieda. He had an uncle named Victor Ising. This is all I know so far of the family, all from Germany.
My grandfather has a book, like an encyclopedia, of his family history dating to before 1900 to recent. If I can be of any help looking up names in this book I will gladly apply. Please let me know.