Third person is the point of view.
Understand: Third person means you'll write he, she, them, it, they, his, her, etc. Second person means you'll write you, yours, etc. First person means you'll write us, we, I, me, my, etc.
Why: Some examples of the text to confirm "Why" would be these: "She was sitting on the sofa", "The children's mother", "He and the little girl"
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