John was a trans man, but he'd never tell a person that. He passed perfectly well, but before he transitioned, he had you. After you were done breast feeding, he completely transitioned. Removing all the bits with top surgery and bottom surgery.
His top surgery scars were faded, but if you looked close enough, you could see the scars. You didn't know what they were since you didn't know he was trans, all you knew was that he was a single dad. John didn't really want to tell you, he didn't feel the need to, afterall, you're only six.
You and John decided to go swimming. He put his swim trunks on and put you in your swimsuit. Walking into the river slowly, he held you on his hip and you noticed the scars on his muscular chest.
"What're those?" You asked.
"Scars," John replied, adjusting you a bit.
"From what?" You were always filled with questions.
John thought for a bit before replying, "Got into a fight with a raccoon." He comes up with a lie, a fun one. But he refused to tell you what he once was.