George was born in Australia (but presumably came on with his parents to NZ) and married (no NZBDM, even for plain "George") Lucy Wastney; no NZBDM death searchable for either spouse. NO NZBDM children to Lucy Croudis by 1917.
Dorothy was born in Nelson, NZ, and m. Thomas Cummings "1881/1874 Dorothy Mary Agnes Croudis Thomas Cummings ": many possible death regs for him but she is probably "1921/10371 Cummings Dorothy Agnes Mary 65Y". NZBDM has no births to Dorothy Cummings; many to Mary Cummings but those with father Thomas are all Mary Ann(e) and Thomas Martin between 1879 and 1884. So Dorothy probably had no children in New Zealand. Legacy.com does not have an obit for her in New Zealand. First 100 Google hits for "dorothy Cummings" do not find her.
Robert was born in Nelson and m. Annie Thomason (according to NZBDM - not Thompson); no NZBDM death for her. Four children. See his article.
John was born in Nelson and m. Hannah Mary Tidd (1869-1916) (who is well-documented at https://www.wikitree.com/wiki/Tidd-190) (NZBDM "1916/3004 Croudis Hannah Mary 49Y"); they had 6 chn; NZBDM "1903/5610 Croudis Louisa Agnes 14Y" may be one child. See his article.
Agnes m. William Thomas Liley (NZBDM "1881/383 Agnes Hannahbella Croudis William Liley") and had 2 chn. See her article.
Andrew was born in Nelson; no NZBDM marriage or death searchable. NZBDM has no Croudis children to an Andrew 1881-1917.
Find A Grave in Dec 2017 had 22 Croudis names - more than half in NZ, including Robert H, - 8 Nov 1920, bur at Motueka; several others at Yarmouth, Cumberland County, Maine. Now listed at Croudis (surname).