Yes, George R. R. Martin has two children, named Darion and Tamsin. They both have grown up and moved on with their own lives, but their father has occasionally mentioned them in interviews and writings.
George has been quite private about his family life, preferring to keep his children’s lives away from the public eye. As a renowned author, best known for his epic ‘A Song of Ice and Fire’ series, he often focuses on his work and personal passions, which include storytelling and world-building.