Do your child ever go out and don't say anything to you?

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Yesterday, my sister 's daughter went out from 10 o'clock in the morning. When my sister called me, it was about 14 o'clock. She told me her daughter still haven't back to home, she was very worried about this. So my sister, my mother, my elder brother's wife, her son and I, went out to find the daughter. We out for whole afternoon to about 5 o'clock. We asked every classmater of her, went to every place nearby and went to her classmater 's home, still didn't find her. My sister cried twice and my mother also cried, they thought she maybe missng, and can't come back. About 6 o'clock, she came back, said she went out to one classmate home which is very far, she was doing homework with her. Do this ever happened to you? How do you deal with this?