Hello sue, My name is Susan Garthwaite presently living in New Zealand. I am aware of the Colin Garthwaite you mention living in the same area as myself but am not sure if there is any relation. My Grand father John Garthwaite now deceased was born approx 1915 in Invercargill NZ. His family emigrated to NZ from England as one of the first settlers in 1840. John married Joyce my grandmother whose children are Faye Garthwaite, Colin Garthwaite, Graham Garthwaite, Malcom Garthwaite, Marilyn Lawn, Ivan Garthwaite, Alison Houston. I am the daughter of Graham Garthwaite and have a brother Cameron as well as many many cousins.I would be interested in any information you could give me on the origins and relations of my family that you may be aware of.