Hello Kerrie How excited I am to see your message. My mothers cousin was Margaret Jessie Underwood and her sister Eversley (Eva) Cox nee Underwood is still alive. Her father was John Grieve Underwood son of Margaret Kay Grieve and Robert ArthurUnderwood. I live in Christchurchand am just copying some old photo albums with lots of photos of the family.
Although this is not my direct line. John Grieve Underwood married my grandfathers sisterMaggie McNair and I am putting together that side so delving into the Grieves etc. I have 3 Grieve families in my research but none look to be related despite coming from a similar area.