Her marriage is fake, just to keep the love story with Peeta alive and to convince President Snow in their love.
Peeta and katniss get married
Katniss Everdeen was 16. In Mockingjay she was 17.
Katniss does not find out in Catching fire, but in the first book, when they are in the cave by the river.
For the public, not real, but at the end of Mockingjay, their married and have two children.
No.
no they do not
Peeta
The main character
There are 27 chapters in the book "Catching Fire" by Suzanne Collins.
No, but she does in Mockingjay.
Still Katniss Everdeen.
Katniss does what Haymitch does