ISB ~ 1 Peter 3 v6

calling him lord:A reference to Gen 18:12, where Sarah calls Abraham “my husband”. The expression is literally “my lord” (Heb., ’adoni). Peter concludes from this that Sarah acknowledged Abraham’s leadership in marriage. Genesis gives no indication that Abraham, for his part, lacked respect for Sarah or considered her a mere slave under his authority.

her children:Not by generation, but by imitation (cf. Mt 5:44-45; Jn 8:39-40).

let nothing terrify you:Wives exposed to mistreatment from pagan husbands are admonished to take courage. The implication is not that Christian women are expected to tolerate such things without complaint. On the contrary, Peter anticipates that a holy and deferential wife will find herself respected and honored by her husband.