Thanks. Yes, he came to NZ though I don't/didn't know much about the details. What story i've heard is that apparently he had a work to pay for fare arrangment. When there was a strike he kept working because he was honoring agreement, and the unionists ran him & family out of town [apparently our family name is still disliked down there long after] which strain led to marriage breaking up, and both later remarried. There were only 2 surviving sons and 1 daughter but there were a few others who died in infancy, and another son (some question about father though) Patrick who lived but was killed in Australia (he was partner in the horse Hyperbola). John/James/"Janis" was murdered a few years ago now like you say. The other son's middle name is Gordon, not sure I'm allowed to say his first name because he is still alive/living (in NZ) though he is my father (so i'm a grandson of william's). William is buried in Paraparaumu, NZ.
I happy to share by PM what little i know about my grand/fathers more recent part of family if you want to know? (I drew a jpg family tree. My trees on myheritage and GenesReunited are only direct line as too much time/hastle to do all the side relatives) (I myself am more interested in more distant ancestry, though also in befriending any relatives.)