It's all in the family?

Hello,
It has been a while since I have written. I have been busy working and trying to keep my DH and I's spirit up. Not doing so well.
Not at all.
So today we had drama. DRAMA. big time DRAMA.
Why is it when people get what they want they are still unhappy and then still hate?
My DH's brother managed to lie and manipulate to force myself and all my children out of this family business. He got what he wanted. My kids are all gone. The youngest one is working part-time after school a couple of days a week. So the brother-in-law (I think I refered to him as Satan in an earlier post) had to get on facebook and send a message to my niece (who I love) about how bad of people we are and how much we hate her. LIES! LIES! LIES! and this all started because my daughter (who is about the sweetest, bestest girl I know) commented on my neices status about how she was excited to see her because they are moving back here. What has my daughter ever done to him?
This is the daughter that has worked for the family business since she was 12. When she was 13 - Satan called her a B****!. She cried for weeks. This was when we implemented the code work "chicken noodles". She was scared for her physical safety at work and if that ever came over the radio or loudspeaker we knew we had to go help and FAST!! By the way....did I mention she was 13? She would never work without me or one of her brothers also working because she was scared. She is now 20 and is a mature and beautiful young woman who desires to do good at all times.
So my DH went to Satan and said he wanted to bring my beautiful daugher back to help in this certain area of the family business. She is very knowledgeable about the product and can work with customers, etc. She also has great handwriting and makes cute signs for the products. The brother (Satan) flipped out and went running to daddy (my father-in-law) to probably fill him up with lies, etc.
My DH followed and had a word war with his dad and his brother. To add to the story my DH's nickname at this family business was the "bastard child" by other employees. Kind of explains how he gets treated by his father and brother. So he told his dad he was sick of how he is treated and how my children are treated and he quit. His dad doubled up his fists and came at him to hit him (anyone thinking of Orange County Choppers here?) My husband told my Crazy FIL to "F*** off" and sped away.
Now he is home and depressed.
Depressed because of how he handled it.
Depressed because of how his family is.
I'm so tired of this.
Why are people like this?
How do you get through this? How can he be part of his family without letting them hurt?
I need anyone's help that I can.
I pray constantly.
I still need more help.