 Even our earthly relationships have to be altered and taken up into the realm of grace. Earthly relationships without God as their foundation, that's not peace. Christ didn't come to bring peace, but the sword. To set man against his father, daughter against mother, daughter-in-law against mother-in-law, so on and so forth. It doesn't mean that we're not supposed to have relationships with others. It means that they all have to be brought into the cross of Christ.