OKAY.
Look you better treat my sister like an empress or I'll chop your (friend) into pieces and gril it and add soya sauce and will make you eat it!! And then I'll use forks to get your eyeballs out of their socket.
AND. DON'T. EVEN. THINK. ABOUT. HURTING. HER.
GOT ME?
AND as am your mom I'll kick you out of my house.