I have a story written that occurred during the Dance that might interest folks interesting in playing bastards and lowborn. "Kevan and the Thorns", a group of knights of Highgarden, three of them bastards, that left their House to fight for the Greens without Highgarden's approval. Ended up becoming morally ambiguous folk heroes, fighting for neither side and both. Could be that one of the Thorns, the bastards, had sons.