I wanna smash you!!

My piano teacher wanted my bro n I to practise piano. So, we got a practice table in our book. Once we practised, we state out our practice time on it, and teacher will check it every piano lesson. My bro is so annoying! He always tell teacher that I didn't practise but I lie 2 teacher by simply write out a time! The truth is I really DID practiced! ERHHH!! How...... just damn it! While my bro, most of the time he got practise, that's what he wrote! Truth is, he DIDN'T! And he lied to teacher, I didn't tell teacher and he say I'm lying! WTH!