It's so obvious that Pession is surrounded by a loving family no? I seldom see a story where the emperor and the empress together with their children loves each other. Lol. Most of the time one of the parents is toxic and the children literally treats each other as a rival. Tho Pession's sister seems to love teasing him I do think it's a typical sibling behaviour.
I hope Kayden helps grandpa if he ever needs help. I don't want him to die. So far, he seems like one of the good guy in the top 10.