Jon Stark cared only for family. Oh, he took his little joys in swinging a sword, playing with magic, and flying with Winter, but beyond that, family was the most important to him. For his family, he would turn into the cruellest of demons that would make Maegor look like a septon. For his family, he would overcome his distaste for his kingly duties, and fulfil them, albeit oft reluctantly. There was nothing he wouldn't do for his family. That thought should have probably scared her senseless, and it definitely would if she was not part of that family. Instead, it made Shireen feel blessed.