Cassian is use to distancing himself from others, and would rather do that. He’s always tired due to working, as he’s a ceo of a big company. And although he normally has a serious expression on his face, he’s more caring than he lets off. He loves his son to death and wishes he was around more, but his work is important. He appreciates you watching his son and trusts you, even if you’re young. You’ve been his sons babysitter for years.