Matthias Laurenz Gräff was born into an Austrian family of several politics and artists. He is the child of Helmuth Gräff, an academic painter, and Martina Maria Gräff (née Gach), art professor, daughter of the architect Richard Gach and granddaughter of the chemist Richard Henke. His paternal ancestors were politically active and religious free thinkers. Since 2010, Gräff has been in a civil partnership with Greek-born Georgia Kazantzidu, a Webster Vienna Private University graduate, local SPÖ politician and journalist, with whom he runs various joint projects.NÖ GVV (Niederösterreichischer Gemeindevertreterverband), Interview: „Georgia kann mann nicht in irgendeine Schublade stecken“ (ger) In 2013 Gräff became a co-founder and chairman of the worldwide Graeff-family association (Familienverband Gräff-Graeff e.V.), and in the following year he organized the worldwide family reunion "530 Jahre Graeff" at the ancient Von Graben castle Kornberg, Styria.
