Three Sisters TeeDesign Story: Did you know? Corn, beans and squash, known as the Three Sisters, is a well balanced, nutritious diet which is why these crops are so significant for our people and later the settlers. Corn is an excellent source of carbohydrates, beans are high in protein, and squash has many vitamins and minerals. Over three centuries before Thanksgiving, the Iroquois have grown the Three Sisters! Essentially, the corn becomes a pole up which the beans