Oldest child to the baby of the family

Katelyn was 18 the oldest of her sibling and had 2 younger sisters Lilly who was 15 and Isabel who was 8 she didn't really care about them and was a bit mean to them and spent most of her time at party's or with friends but one day she found a object that had a red button on it and turns into a toddler with the object disintegrated into dust and can never be turned back to normal