Lessons unlearned

So not only is my sister dating a good for nothing little shit head, but she seems to disregard everything that she should be doing with her life. she hasnt even graduated highschool yet, and her life is going down the drain at an alarming rate. I found otu today that she thinks she might be pregnant, but i didnt find out from her, not even for the little shit head, but from my neightbour who has been out of the country for the last week. So please explain to me how she would hear wind of this before i did in a work palce where me, my sister, and the shit head all work. and the fact that apparently the rumours of said pregnancy have been circling for weeks!!! Confirming what i was told by Bobbi Jo, who said that my sister had taken about 6 home test, which all came back possitive, and then went to the doctor, and his came back negative. Leah told bobbi jo that she had talked to my mom about it, but i dont believe that becuase it would absolutely kill my mom, not to mention that fact that leah is never home to talk to anyone. Not that any of that is enough, but while my mom is out of town the shit head has been here, and to top it all off, despite the fact that she hasnt learnt her lesson with the current pregnancy scare, they are still having sex. So if i wanted to kill him before, imagine the racing hurricane of emotions burilding in my chest at this very moment.