You shouldn't dominate your kids-in-law.
Michael just married a woman whom has three children.
Michael wants the children to accept him as a father.
Michael spends time getting to know the children, and is very forgiving at first when they break the rules.
Michael is very strict and implements very draconian punishment system in hopes of earning the respect of the children.
The children begin to trust Michael and eventually start calling him father.
Michael's wife disproves and ends up divorcing him.