1. The third hit here
https://www.google.co.uk/?gws_rd=cr&...+child+benefit goes to some old threads on the forum.
2. In time, once you have held Residence for the qualifying amount of time, you could sponsor your parents for Residence if they are eligible. Details here.
http://www.immigration.govt.nz/migra...categories.htm You can't directly sponsor your brothers for a visa, but if they qualify for some kind of visa themselves, you can offer sponsorship for their maintenance.
http://www.immigration.govt.nz/migra...ponsorship.htm
3.
http://en.wikipedia.org/wiki/New_Zea...nent_residency This is a rough outline.