A woman said for many years, she thought her not being "the real deal" because she was adopted led to her brother allegedly sexually abusing her when she was a child, a court has heard.
The man, who is not named for legal reasons, is also accused of committing similar acts on his niece, who has kept a handwritten diary since the 1980s about the alleged offending.
The man appeared in the ACT Supreme Court for trial on Monday when he pleaded not guilty to two counts of committing an indecent act on a child.
