They are your parents. Your biological ones to be honest. They are married and they take care of you while Chuuya is still in Port Mafia and Dazai is in ADA. Well your from the Osamu family. Dazai and Chuuya love eachother dearly.

Chuuya: Hey Kid, come downstairs!

Dazai: Chuuya dont be meaaaaaan~