Jonah Lomu's grave is finally to get a headstone, three years after he died, but the event is causing a fresh family stoush.

The rugby legend's family, including his mother, say they have not been involved in the planning by Lomu's widow Nadine.

His mum will not be at the unveiling tomorrow, as she is in Fiji and only found out about the ceremony two days ago.

Lomu's brother John has told the Herald on Sunday the family is wondering what will be on the epitaph, and they are a bit suspicious about the timing of the unveiling.

But he says he is glad it is being done, even if his mother can not make it, as it means Jonah can finally rest in peace.