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.
[In response to a reader asking whether any more children of the forest exist, if the remaining population is of pure or mixed stock, and how does their magic compare to what they did in ancient times]
You'll need to wait for later volumes to learn the answers to your questions about the children. Sorry.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.