Ok you guy have seen this question alot on this site so when you answers please dont say just search next time cause its really not the same thing.So my 11year old sister and her boyfriend come in the house from her window i was at home with her cause my mom went somewhere for about an hour was not in charge so i was not look after here like every 5min.So i was going to make some food and i want to know if she wanted some when i went in her room i found her and her boyfriend have sex.i told him to get if stuff and get out now.I asked my sister why she did it and she said because you did it so why cant i do it(I feel like a really bad sister now. am 13) And she said if i tell mom on her she well tell on me what should i do she can keep have sex.