KNOXVILLE, Tenn. — Have you ever wondered what it's like to work side-by-side with your siblings? For the Crespo sisters, that's not a daydream — it's real life.

These sisters from Puerto Rico all work at the same school. They're turning family ties into educational impact.

Within the doors of Karns Preschool, laughter greets you from the front steps — and it comes from three sisters. Meet Shaida Crespo, Melissa Crespo Galloway and Melinda Crespo — all educators at Karns Preschool.

Like any tight-knit sisterhood, they're each other's cheerleaders — and biggest teasers. They're teacher assistants with one goal: to make a difference in early childhood education.

"My youngest child has autism — and I know the challenge that comes with that — and I want to make a difference not only for th

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