HEATHER HOLLINGSWORTH and TODD RICHMOND Heather Ousley sits with her older children Elliannah, 15, right, and Samuel, 13, in front of their home in Merriam, Kan, Tuesday. Ousley was thrilled when she heard the FDA was expected to authorize Pfizer’s COVID-19 vaccine for youngsters ages 12 to 15 and was hoping to get her kids vaccinated as soon as she can. (AP photo) MISSION, Kan. — After more than a year of fretting over her 13-year son with a rare liver disease, Heather Ousley broke into tears when she learned that he and millions of other youngsters could soon be eligible for the COVID-1...