Reyson lost almost all his family during the Serenes genoiced, although his father and his sister Leanne survived the tragedy:

leanne: Reyson really cares for Leanne. He thought she died in Serenes 20 years ago and he was really relived when he discovered she was still alive and in good health. He usually listen to everything she sais and he consider her as wiser than he is (although she's younger and naiver). They're bond is very strong, especially when they find themselves once again, after all they're sorrow ad all the proofs they had to pass on.

reyson's father: (sorry I don't really remember his name, nor I have any image of him). We never see him during the game, but we know he felt in a depression state after the happening in Serenes and that he's really ill right now. When Leanne and Reyson meet again, he's somehow relieved and he starts to feel better, probably because he knows that Reyson isn't alone anymore. He deeply loves his son and Reyson feels the same for his parent.