A woman allegedly subjected her sisters to "systematic sexual abuse" for seven years when they were children, using violence and "emotional manipulation" to keep her siblings silent.
She is accused of holding one of the girls' heads underwater in a bath, and making threats to harm family pets if the pair spoke out.
There was also alleged choking, the use of pressure points to inflict pain, pushing, punching and kicking, the ACT Children's Court heard on Wednesday.
