Hallo Angela, I'm Sarah's mother and yes, Neil was my father-in-law, grandfather of Sarah, Nick and James. He was a much-respected GP in Christchurch, as was his father James Whetter. All we knew about their Cornish origins was that Neil's grandfather had been a station master and owned (?) a tin mine. We would be interested to know more! There was another Whetter family in Nelson, not directly related.
Sarah has just sent me this link, so I'm off to search for some of my ancestors. Regards, Juliet