“Shortly after moving there, Susie’s oldest daughter, who had just turned 15 years old, also said she felt like a boy.”
You know what the cure to this is? As soon as they want to be a boy, start giving them boy’s chores. If they are a boy, they can mow the lawn, rake leaves, shovel snow, clean the gutters, dig up that nasty weed bush down to the roots, etc.
I guarantee you after a week or two of that, they will want to be girls again.
Brilliant!