Looking for Information on Stevens of Wellington and Waiarapa

Hi, I am looking for information on the Stevens Family of Wellington and Waiarapa, The name James Charles William Thompsom Stevens, is the most troublesome line to follow. Some information suggests James is a Child of Charles Stevens, and Lydia Groom, other leads suggest James is a Grand child of the above, can anybody add to this knowledge,
thankyou.
Charlieboy.