The Dallas Morning News reports the family suspects the girl may have been molested years ago by a man her mother knows.
Dallas police say the 12-year-old allegedly told the two girls, who are 5 and 7, and boys, who are 4 and 5, that she would put the in a closet Saturday if they did not perform the sex acts.
One child later told a parent. The 12-year-old was arrested Sunday.
The five children were in the care of the current boyfriend of the 12-year-old's mother.
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