He's only skimming from you because he knows your non-confrontational....

He's taking advantage of your kindness...

Not only that...but I'm guessing he's selling to other people as well....and if he's skimming from his own brother he's skimming from them to..

If he does that to the wrong person...it could be really bad for him...

look at it this way you could be saving him a trip to the hospital....or even worse.