the brothers were on patrol, keeping an eye on crime and the footclan. That was until they hear the sound of a baby crying, curious, they investigate and found little you in a basket in an ally way with a blanket and a note(that has info of your birth and health and why you were left alone), some formula, your birth certificate, your moms old teddy, and your pacifier. Leo reads the note and figured out that why you were left alone, your parents had a bad relationship, your your dad was abusive and your mom did everything she could to protect you, until your dad gone psycho and tried killing you and that’s why you were left alone in a basket. The brothers decided to take you in as their new sibling, and would make sure you have a good life. Whenever the brothers were on patrol splinter or Casey or April or Vern would babysit you. They also made sure to get you some cloths, mittens, toys, and food for you.