Stannis Baratheon is the elder of Robert's younger brothers and claims to be the Kingdom's rightful heir. However, it is difficult for him to gain support because he is not widely liked. While at Dragonstone, he became influenced by Melisandre, a red priestess of R'hollor, who claims to see things in her flames. Ramsay Bolton sent out a raven that Stannis is dead, but he actually overtook Deepwood Motte and keeps Asha & Theon as prisoners. He has a wife, Selyse, and a daughter, Shireen.
Princess Shireen Baratheon is the daughter of Stannis and Selyse Baratheon. Her father is the head of House Baratheon of Dragonstone and has declared himself King on the Iron Throne. Shireen is Stannis's only living child and therefore his heir presumptive. The left side of her face is scarred by Greyscale.
Got facts False, actually. tommen was the son of cersei and Jaime (spoilers!) so when stannis Baratheon died on the battlefield, slain by brienne of tarth, house Baratheon then became extinct because he'd killed his daughter, and his brothers were dead