Once upon a time there was a single father and a teacher.
They were brought together by the single father's 10 year old son, who the teacher taught at school every day.
After the teacher stopped teaching the boy, the father and teacher were able to date in public after 6 months of dating in secret, so as not to get in to trouble with the school board so the teacher wouldn't lose his job.
During the summer before the boy's new school year he celebrated his 11th birthday. His daddy and his old teacher got married the day after his birthday going on honeymoon straight away, after leaving the newly turned 11 year old with his uncle and aunt.
The boy was his father's best man. While on honeymoon they newly married couple tried to get pregnant to make the original son a big brother.
While they were still dating, the son had grown used to calling his old teacher mom. On one of the many family dates that the father and teacher insisted on, it came out that the teacher had been taking cooking lessons to impress the father and son, who the teacher knew spent time cooking and baking as a bonding experience, and he wanted that.
The father and son were impressed with the teacher and his willingness to learn so he could bond with them they asked the teacher to move in with them as soon as the school year ended.
They spent several weekends packing boxes at the teacher's old apartment. So as soon as the school year ended the first weekend they had off, they moved the teacher in.
The son's birthday was the best one he had ever had. He had presents cake a party and his daddy was getting married the day after, he had asked his teacher while they were cooking dinner for his daddy what he should call his old teacher when his dad married the teacher.
So the teacher told him he could him mom, because that would be what the babies that the teacher and the boy's father would call him. The boy liked that, he had never really had a mom, and the woman who had given birth to him was in prison for trying to kill his daddy, the day his father and teacher got together.
When the new school year started he was in a new class, with a different teacher. The new teacher liked his mom and tried to steal him from his father. But the day that the new teacher asked his mom out, his mom had found out that he was pregnant.
The father was over the moon that his 'wife' was pregnant. When he was told he was worried that his son would be jealous of the new baby, but it turned out that the son loved the new baby and was the best big brother any sibling could ask for.
During the pregnancy the new teacher continued to pester the pregnant teacher, not believing that the pregnancy was from a loving marriage.
On the day that the 'mom' goes in to labour the new teacher kidnaps him trying to kill the 'mom' and the new baby, but they are saved by the father.
The whole family decides that it would be best for the 'mom' to stay at home with the new child.
Soon the son is going to college and his new sibling is going to school, but before he leaves for college it turns out he is having another sibling as his 'mom' is pregnant again.