Aotearoa / New Zealand

I don't know if it's allowed here, but i matched with some cousins on ancestry. We figured out that their cousin Robert Little must be my grandfather. They say they don't have much contact with Bob and were unable to give me a phone number for him. Google searches for him have come up empty.

This is all the information i have, and im hoping someone can help me.

Robert little lives in Whanganui and has a son named Roderick. Roberts parents were Winifred White and Tom Little.

We're 95 percent sure this man is my grandfather and would like to find him before it's too late. I don't think he knew he had a daughter, (my mother) and i want them to meet.