He's already a girl.

Zander pointed at his body only to realize the T-Shirt and PJ bottoms he was wearing were replaced with a pink and purple version of his normal ones. The bigger surprise was that he had breasts. He grabbed at his chest and then to his crotch. His member was gone, replaced with a slightly moist slit.

"What happened?" he grabbed his throat the baritone voice he used to have now replaced with a feminine soprano.

"Sometime," his mother continued, "If the family member is the wrong gender for the genre they will be transformed."

Zander grabbed his head in frustration, "This can't be happening..."

"It is, but don't worry Zelda you will be able to acclimate to the changes easily enough."

"Zelda?"

"Well we can't keep calling you Zander now can we?"