If he was 8-12 when it happened, he would have likely bragged to a school friend about it.
If no one comes out of the woodwork in the next 3 weeks, she’s likely a nut job.
Pretty sure normal dudes that age wouldn’t brag about doin their sister. Maybe that was just where I lived.
“If he was 8-12 when it happened”
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Something could have happened, but in those years I think most of us guys didn’t give such things a whole lot of thought, much less do them. At that age, a pile of comic books and some bottles of pop and I was about as satisfied as I could be.
If he was 8, he probably didn’t perceive that it was sex.