I played with a premade family and there was a childhater with a wife, who wanted to have a big family. I didn't want to destroy their marriage, because everything else was perfect. But then the woman cheated on him with their roommate and got pregnant. In my story it was her plan to get pregnant and tell her husband, that contraception haven't worked out for them two, so she could have at least one baby (not 5, because I respect the man's wish NOT to have a big family). But somehow he has figured out her lies. And he has lost his trust to her. She tried to talk with her son's biological dad, but he got mad too. She left her home with the baby and moved to a new house. They divorced later.
Then she met my Steve, who was single back then. They liked each other and tried to see if it could work out for them. Steve was almost ready to become a stepfather, but once that single mom invited him to her party. He came and found her cheating on him... With her own ex husband, who she used to be enemies with. Well, true love never dies. As they fought such huge problems, my goal was to help them get back together and marry again. He even became a good stepfather and Steve chose his university friend, who became truly a perfect wife for him.
