@Gumbootcitynz The Residental Tenancies Act doesn't apply to renting from family members. And since you only pay the rates (and not rent) It shows that neither party intended a residential tenancy to occur. So there are no ”default” tenancy rules in your situation.

But the Tenancy Tribunal still has the power to issue eviction orders (even when no tenancy exists). So you and your uncle just need to submit an application to the Tenancy Tribunal. And when you get the eviction order, get the Police to help enforce it.

If your personal safety is immediately threatened (domestic violence) Call the Police!!!

The Police have the power to issue on the spot protection orders. Which would force the father to immediately move out of the house. And yes, they will issue and enforce such orders for male vs male and female vs male (either direction) domestic violence.

After the Weatherston court case (that prompted the government to remove the defence of provocation). The Police now have to treat all domestic violence cases very seriously. Not just male against female cases.

Still go and see Citizens Advice Bureau. As they can arrange free short meetings with a lawyer. As I'm guessing that there might be some sort of challenge to the ownership of the house. However assuming that the uncle is the only person named on the title. Pretty much the only way for the father to challenge that is to prove in court that the uncle acquired title to the house via fraud.