I've just spoken to my Nan again, at 86 she gets a little confused when pushed for accurate info, but she reckons her dad (William) had 6 siblings. George, Arthur, Elsie, May, Fanny and Ninah. Elsie had 2 daughters called Nellie and Jessie.
As for my g grandmother, Hilda Maggie Clerk Watson, her parents were James and Margaret (nee Park) and they had a farm at Little Faraquay (not sure of spelling) and moved down into the town when the "ministry" took all but one of their ponies at the onset of WW1.
My nan gets very proud to retell how so many of George (or Arthur's) offspring have colonised the south island of New Zealand and there's a huge colony centred around Toowoomba in Australia too. I need to follow that up but I think that will not happen 'til after Xmas.