Twenty-one children are in the custody of a California child-welfare agency while authorities investigate a Los Angeles-area couple and whether they misled surrogate mothers around the country. Fifteen children were removed from the couple’s opulent home in Arcadia after an abuse allegation in May, and another six living elsewhere were also located, Arcadia police Lt. Kollin Cieadlo said. They range in age from 2 months to 13 years, with most between 1 and 3. “We believe one or two were born biologically to the mother,” he said. “There are some surrogates who have come forward and said they were surrogates...