Zachary Wilson, 19, died at his father's home just over a week ago without knowing he had contracted swine flu.
He was an asthmatic and health officials say swine flu was likely to be a major factor in his death.
His mother, who declined to be named, said young people like Zachary often thought they were indestructible and did not ask for help.
She encouraged other young people to seek help from Healthline or their doctor.
Zachary's father has been given the all clear from swine flu after spending the last week in isolation.
He thanked the public for respecting his family's privacy.
They were still grieving the loss of a much-loved son, cousin and nephew and now had the news that his death was swine-flu related to deal with.
Zachary is one of three people with swine flu who have died in New Zealand.
All had underlying medical conditions.
The number of New Zealanders confirmed to have the illness has topped 1000.
