Parents need to know that A Song of Fire and Ice -- adapted for the popular and very mature TV series -- is a seven-volume fantasy saga by, of which only the first five volumes have been published as of April 2016. Set in a magical version of the Middle Ages, it chronicles the exploits of the Stark, Baratheon, Lannister, and Targaryen families as they struggle for power in a deadly civil war. Violence percolates through nearly every scene, including sword fights, beheadings, rapes, wolf attacks, death by molten gold, and more. Sexual content includes an incestuous relationship between a brother and a sister, the marriage of an older man to a teen girl, and a prince's love affair with a courtesan. The language is predictably rough, ranging from "hell" and "damn" to "f--k" and "c--t." If the books were rated as movies are, they would receive a "hard R."
There have been many fantasy sagas published in the last half century, but few can boast the scope, depth, and attention to detail of A SONG OF FIRE AND ICE. George R. R. Martin is a master plotter, moving his huge cast of characters from one harrowing situation to the next and keeping readers anxious and surprised again and again. Some of the first five volumes work better than others (A Feast for Crows leaves many readers disappointed), but all add new elements that only increase the complex richness of the narrative.
This book series is certainly not for sensitive readers. The language is rough, the violence is brutal, and the sexual content sometimes veers into the perverse (including brother-sister incest). But readers with the maturity to handle adult material will be amply rewarded. Martin is a serious storyteller of the first order, and A Song of Fire and Ice is his masterwork.