The issue of who can consent to the Covid shots is providing fresh context for decades-old legal, ethical and medical questions. When parents disagree, who is the arbiter? At what age are children capable of making their own health decisions and how should that be determined? “Isabella wants it because her friends are getting it, and she doesn’t want to wear a mask,” said Charisse, a mother of a 17-year-old in Delray Beach, Fla., who asked that her last name be withheld for family privacy. Charisse fears the shot could have an effect on her daughter’s reproductive system (a misperception that public health officials have repeatedly refuted). “Isabella said, ‘It’s my body.’ And I said, ‘Well, it’s my body until you’re 18.’”... “We may be in a legal gray zone with this vaccine,” said Dr. Sterling Ransone Jr., a family physician in Deltaville, Va. In his health system, a parent can send a signed consent form for a teenager to be vaccinated. But because the Covid vaccine is authorized only for emergency use, the health system requires a parent to be present for a patient under 18 to get that shot.