On-line Te Reo Māori Dictionary

Ko Aroha te mokopuna tuatahi.
Aroha is the first grandchild.
Identity sentences - ko...

Ko James te tamaiti tuarua o te whānau
James is the second child in the family.
Ordinal numbers (First, second, third...) - tuatahi, tuarua...

Ka kite ia i a Hēmi i te kaipuke.
He saw James on/in/at the sailing vessel.

Ko James Tait tōku tipuna.
James Tait is my ancestor.

Arā a Hēmi e oma mai ana.
There is James running.

Ko James te mokopuna tuatahi.
James is the first grandchild.