Korra and I

In my story Katara and Aang have one last child and when she turns three weeks old he dies. It was a girl and her name was Kyomi and she is almost 1 year older than avatar kora and they face life together as friends.
THE AGES OF THE CHARACTERS
Katara-84
Bumi-55
Tenzin-45
Kyomi-18
Kya-53
Korra-17 1/2
Jinora -12
Ikki-9
Meelo-5
Bolin- 18
Mako-19 1/2
Asami- 18