If you found out that your sister was not of your mother and father but of a questionable rape/ alcohal when do you think she should tell her? She is 12 years old now. Should she tell her that she has a sister that is of the possible rapist and another woman? How should she break it to her. The veiw of this from my point of veiw has changed so much in the last couple minutes. She still is my sister and always will be, but what should my mom say? please help us with this issue. thank you.