Answer:
According to Kohlbergs stages of moral reasoning, Joseph is at stage 3, that states conventional moral reasoning while the substage is family and group. This level states that being moral is creating or nurturing long term relationships among groups and families.
Here Joseph is child and for him, morally he should get equal time being the son as far his moral compass is matured. He measures his level of relationship with his father through this moral compass and might take it longterm.