New Zealand Law
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The main problem is that under the act of parliament about paternity, (The Status of Children Act) you cannot raise this after the child turns 6. It is possible to use DNA evidence which would be definitive, but getting this is difficult without consent. If it was possible to obtain a sample of saliva or hairs from the child you could get these tested. But to get those samples you would either need consent or obtain them covertly.
The test under the Family Proceedings Act is-
Time limit on applications for paternity orders
(1)Subject to subsection (2), no application for a paternity order in respect of a child may be made after the expiration of 6 years from the birth of the child.
(2)An application for a paternity order in respect of a child may be made after the expiry of the period specified in subsection (1)—
(a)where at any time within the 2 years immediately preceding the making of the application, the respondent has—
(i)contributed to or made provision for the maintenance of the child; or
(ii)lived with the mother as if he were her husband or civil union partner; or
(b)where at any time before the making of the application, the respondent has admitted expressly or by implication that he is the father of the child :
(c)where, at any time before 1 July 1992, the respondent has been named as a liable parent for the purposes of sections 27I to 27ZI of the Social Security Act 1964, and the bringing of an application for a paternity order is subsequentl
Unfortunately the court route may now be closed, as appeals are not possible as you know. That is why I suggested seeing if you can either ask for a sample for DNA testing or perhaps obtain one if that is possible.