Ok some ppl got confused as to which kid belonged to who, so I'll just post a little profile thing for each character.

Zero

Age: 18

Parents: Quatre Winner, mom died

Comes from: Earth

Currently lives in: Earth

Zoe

Age: 17

Parents: Duo Maxwell and some unidentified bar girl who left Duo with the task of raising her up

Comes from: L2 Colony

Currently lives in: L2 Colony

Zeyz

Age: 13

Parents: Heero Yuy and Relena Peacecraft

Comes from: Earth

Currently lives in: Earth

Ai

Age: 12

Parents: Trowa Barton, mother's name unknown because Trowa never mentions it (said to have died when Ai was really young), has a younger brother called Hidaki

Comes from: L3 Colony

Currently lives in: Earth



I hope that clears some things up for you guys!