They work closely with local businesses, which offer services or gift vouchers to help with presents for children.
They also organise events including music therapy courses and Sunshine Week - when popcorn machines and icecreams are brought into the children's hospital ward as kids watch movies in a specially-made theatre.
For families where a child has died, bereavement grants of up to $500 are given out to help with costs.
Mr Topperwien said organising such events for youngsters and families was hugely fulfilling to them.
"We get to talk to people who are going through hard situations and we can relate to them first-hand, because it's what we went through. It is so physically and emotionally draining when your child is sick and so doing this helps us too."
About pride of New Zealand Awards:
Anyone can nominate people they feel are unsung heroes working hard to make a difference within their community. The awards are being held in association with this paper, the New Zealand Herald, The Hits radio station and TSB Bank.
The six categories honour bravery and heroism, community spirit, environmental leaders, emergency heroes and fundraisers. A special lifetime achievement award will be given and there is a people's choice award.
For more information and to nominate visit the Pride of New Zealand website - www.prideofnewzealand.co.nz