From A Wiki of Ice and Fire
|the bastard's bastard|
|Book||The Winds of Winter (appears)|
The bastard's bastard is how Victarion Greyjoy refers to a thrall and oarsman in the Iron Fleet. He's the bastard son of a bastard.
He is big.
The Winds of Winter
|| Warning |
This information has thus far been released in a sample chapter for The Winds of Winter, and might therefore not be in finalized form. Keep in mind that the content as described below is still subject to change.
The bastard's bastard is one of the oarsmen in the Sparrowhawk. He is one of the three thralls that Victarion recruits to blow Dragonbinder. He is promised to be made free and given a wife, land, a ship and thralls of his own if he survives.