Mei on Family Tree Circles

Hi there,
Im trying to trace my campbell family as far back as i can go...so far can only go as far as my great grand parents. If anyone can help me piece it all together that would be great!

My grandfather is Tom Campbell, he married Rose (rosie?)...someone...

They had 7 daughters- Ethel, Raina, Polly, Darlene, Henga (hinga?), Kathleen and Mereana.

And 1 son- Tahana.

Ethel is my real grandmother, she had 3 children to Texas Johnston, Maharanui (my mother) Victoria and Lehi (who were twins).
My mother was adopted by Kathleen who married Hawea Mataira of Nuhaka.

I don't know much about the other sisters except for Raina who has kept in contact with me.

Any information would be very much appreciated