For some parents who share custody, the Covid vaccine has created a minefield of issues that initial divorce decrees could not have anticipated.
In late 2021, Adele Grote, a divorced mother of two in Minneapolis, took her children to a vaccination clinic at the Mall of America. But when her 13-year-old daughter called her father to let him know they were getting the shot, Ms. Grote knew they would have to leave without it.
Just over a...