(Ben Margot | The Associated Press) In this photo taken Tuesday, Oct. 29, 2019, Zum driver Stacey Patrick, right, waves goodbye to student Saahas Kohli, left, and his mother, Alpa Kohli, obscured behind her son, as he returns home from school in Saratoga, Calif. A handful of ride-hailing companies have surfaced that allow parents to order rides, and in some cases childcare, for children using smartphone apps. The promise is alluring at a time when children are expected to accomplish a dizzying array of extracurricular activities and the boundaries between work and home have blurred. But the companies face hurdles convincing parents that a stranger hired by a ride-hailing company is trustworthy enough to ferry their most precious passengers.