Looking for Information About Elizabeth Munhall 1839 1869

I am looking for any information anyone has about Elizabeth. Where she might have lived, which iwi she descends from?

Elizabeth Munhall is the daughter of Hugh & Marion Munhall. Elizabeth and her siblings (Robert, Maria, Annie & catherine) may have been some of the first half caste children in the area. I would like to know what Iwi they descend from.

Elizabeth married Willoughby Brassey and they may have lived in Whangape 1863-1864.

Any information anyone has regarding the Iwi connection would be appreciated. Or even where I might start looking.

Cheers
Lisa
:)