The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
New to the series? Read our spoiler-free review of A Game of Thrones.
1. For which Hand was dug the passage to Chataya's?
No comment. Feel free to theorize...
2. How could Lady Joanna Lannister have been a childhood friend of Prince Doran's mother? Doran is 50 in ASOS and Tywin, what, 57-58? Was he significantly younger than his wife?
The queen's companions weren't necessarily all of an age. Take a look at the group of ladies who attend Margaery Tyrell, for instance -- a mixture of girls her own age and some who are notably older and younger.
No, Lord Tywin was not significantly younger than his wife.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.