The officers did not immediately realize that seven of the 13 siblings were adults, they were so emaciated. The eldest is 29, the youngest 2.

The parents were arrested on nine counts each of torture and child endangerment.

Above, the family’s home in Perris, Calif.

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• A Senate hearing on President Trump’s border wall plan was instead dominated by discussion of the president’s language during a White House meeting last week. Kirstjen Nielsen, the homeland security secretary, was quizzed about the vulgar words Mr. Trump reportedly used.

“I don’t dispute that the president was using tough language,” said Ms. Nielsen, who was at the meeting. But she denied hearing Mr. Trump call African nations “shithole countries.”

The administration also released statistics showing that the vast majority of people convicted of terrorism charges in the United States were born in foreign countries, a finding that Ms. Nielsen called “truly chilling data.” But the statistics were notable as much for what they did not contain as for what they did.

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