User blog comment:GravityMan/MBOHS Season 2: The Three Bears vs The Three Pigs/@comment-24322797-20150919181035/@comment-5412428-20150919201425

I sorta touched on that in the rap. "Then you got adapted and one became the mother!" In the traditional, original tale they came from, they were a trio of bachelors, sometimes brothers. It was only until later when it was changed to Papa, Mama, and Baby.