His involvement has already helped to bring in up to $50,000.
Today, Maori Party MP and co-leader Te Ururoa Flavell also came out in support of the whanau, who have started a 200km hikoi to try raise more donations.
"The whanau require funds to enable them to access specialist treatment in the United States, which will provide Ka'iulani with the greater chance of surviving this cancer.''
Flavell said he was a good friend of one of Ka'iulani's aunts, who asked for his backing of the cause.
The hikoi will go on for a week and will see people walking through Hauraki, Waihihi to Maketu and Kawhia.
To help Ka'iulani visit her GiveALittle page.