1) While the base rate for sexual abuse, by a sibling, of a toddler is already extremely low (sexual abuse of children is somewhat rare. 'Abuse of toddlers' and 'abuse by siblings' are both much rarer subsets), the claim that both of her brothers were abusing a sibling toddler makes it drastically rarer. Even for identical twins, more mundane sexual preferences such as homosexuality only have ~33% correlation. Both her brothers having the outrageously rare sexual proclivity to abuse a toddler sister is close to astronom... (read more)
3 factors I haven't seen highlighted:
1) While the base rate for sexual abuse, by a sibling, of a toddler is already extremely low (sexual abuse of children is somewhat rare. 'Abuse of toddlers' and 'abuse by siblings' are both much rarer subsets), the claim that both of her brothers were abusing a sibling toddler makes it drastically rarer. Even for identical twins, more mundane sexual preferences such as homosexuality only have ~33% correlation. Both her brothers having the outrageously rare sexual proclivity to abuse a toddler sister is close to astronom... (read more)