I hate my so's brother
Do you have a good reason to hate him?
He's so irritating always slacking off
It is a shame you have these issues with your so's brother. You should be able to get along with the family of your so. You need to work on letting go of some of this.
Fucking annoying shits he's been making my life miserable. He's just a slacker and thief
If you think he is stealing do you have any proof? If not you need to talk with your so and tell them about it. You might get to the bottom of what is going on.