On-line Te Reo Māori Dictionary

Ko John te tungāne o Fran.
John is the brother (of a girl) of Fran.
Identity sentences - ko...

Ko Fran tōku whaea.
Fran is my mother.
Family relationships - mother - mama, whaea

Ko Margaret te tuakana o Fran.
Margaret is the elder sibling (of the same gender) of Fran.
Family relationships - older sibling of the same sex - tuakana

Ko Elizabeth te tuakana o Fran.
Elizabeth is the elder sibling (of the same gender) of Fran.
Family relationships - older sibling of the same sex - tuakana

Ko Brian rāua ko Fran ōku mātua
Brian and Fran are my parents
Talking about more than one person - ...rāua ko..., rātou ko...

Ko Brian rāua ko Fran ōku mātua.
Brian and Fran are my parents.

Ko Elizabeth te tuahine o John.
Fran is the sister (of a boy) of Elizabeth.

Ko Fran te teina o Margaret.
Fran is the younger sibling (of the same gender) of Margaret.

Ko Fran te teina o Elizabeth.
Fran is the younger sibling (of the same gender) of Elizabeth.

ko Fran tōku māmā
Fran is my mother