My 40th birthday ended the moment my sister exploded at my teenage daughter over a bicycle—and crossed a line no mother could forgive.

Physical therapy began with movements so small they felt insulting.

Lift your arm.

Hold.

Breathe.

Again.

Emma hated it.

“I used to run bases,” she snapped one afternoon after a session. Sweat dotted her forehead. Her face was pale with effort and anger.