Stepchildren
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1 Timothy 5:8
If anyone does not provide for his own, and especially his own household, he has denied the faith and is worse than an unbeliever.
Ephesians 6:4
Fathers, do not provoke your children to wrath; instead, bring them up in the discipline and instruction of the Lord.
Proverbs 22:6
Train up a child in the way he should go, and when he is old he will not depart from it.