Correct spelling
Kudos to the bad guys for writing "you're" and not the expected "your" in blood. I was impressed.
No so impressed with the convoluted plan, tho. Why not arrange for masked robbers to break into mansion with guns, shoot mum, dad and certain siblings, ransack and pretend it's a robbery and leave.
It would all be over in 5 minutes and would be believable to police. The brothers would get their inheritance.
But then I guess there'd be no movie to watch.