People like Huata do them no good.
However, it is up to the mothers and the biological fathers as well, to ensure anyone living in a house with their children is looking out for their child.
Especially children too young to tell their dad, mother, grandparent, uncle, aunty, cousin, neighbour or teacher that someone living in their house is hurting them.
Although Mrs Te Ahuru lived in Australia she visited her grandson on a regular basis and rushed back as soon as she heard he was hurt.
With just one look she says she knew Matiu's injuries were not from a fall as Huata claimed.
Mrs Te Ahuru says the lives of her whanau are shattered and the "life no longer feels ordinary".
She's right. Matiu died at the hands of someone who should have been caring for him.
His life is gone.