Looking for Ranger Peterson Nz

My greatgrandmother was Margaret Ranger (nee Peterson) She died 4/5/1933 and is buried
in the DUNEDIN Southern cemetry. The Petersons came from the Shetlands (Twatt).Margaret
married William Ranger from Wiltshire. Her last address in Dunedin was Nicholson Street.
Her daughter Cathreine Jane was my grandmother, she married Joseph McFARLANE born Perth
Scotland. My father was named Andrew Peterson McFarlane.