Doesn't matter. In Scotland, we have variously a former BBC news reader who was married to a politician and a Gaelic child actor (often on BBC made programmes) whose father was MP for the Outer Hebrides and whose uncle was a BBC news reporter. You could argue neither of those were political roles. It comes over as very cliquey and nepotistic to me. There are millions of people in NZ, many of whom can't get into these circles, and folk at the top of politics and media hang around with each other. Then the public wonders why they come over as out of touch.
Ardern's ?uncle was also a big noise in the Mormon church. Used to run the Pacific region, where it has major influence in countries like Samoa and Tonga. She's well connected.