Answer:
Mrs. Whatsit - The youngest of the three celestial beings who accompany the children on their adventure. Meg initially comes to know Mrs. Whatsit as the tramp who stole bed-sheets from their neighbors and then sought shelter from a storm in the Murrys' warm kitchen. She later learns that Mrs. Whatsit gave up her existence as a star in order to fight the Dark Thing.
Mrs. Which - The oldest of the three celestial beings who accompany the children on their adventure. Mrs. Which has difficulty materializing and is usually just a shimmering gleam. Her unconventional speech is usually rendered in capitalized words, with the first consonants repeated several times.
Mrs. Who - The second of the three celestial beings who accompany the children on their adventure. She usually speaks in quotations from famous thinkers and writers because she finds it too difficult to craft her own sentences. When the children first meet Mrs. Who, she is sewing sheets in the haunted house in their neighborhood.
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