7 years into a military career, my FIL talked me out of reenlisting and instead coming to work for him and his business partner at his company. My first clue there was gonna be problems was that when I moved us to where they were, I was told I was going to have to interview and might not get the job. WTF?! Got the job. They built commercial sound equipment used for everything from airport PA systems, Large Vegas venues, rock concerts, etc. I discovered they were having financial problems when my son was born and the medical insurance premiums were not being paid to the provider. Later discovered they were not sending my taxes to the state. When I confronted him and his partner, they replied by going to a convention for NAMM. (National Association of Music Merchants) The next day at the end of the day, an accountant met me at my desk with an envelope and told me it was my final pay and to hand over the keys. In the envelope was a check and a note from my FIL saying he was sorry it was done this way, blah, blah, blah. He didn't just fire me, I can handle that. He tossed his daughter and his two grand children out without any income, medical, etc. We lost the house, car, got into severe debt but eventually bounced back. If it were me, he'd never have had heard from any of us, wife and grand kids included, ever again. I packed us up and was moving to Arkansas when I got an interview with the electric company. I started at almost double my pay, got right with the creditors and became an advocate for financial independence.
In the end, I let my wife decide how we would handle them as far as visits, etc. She's very forgiving....
Eventually he lost the business and died pennyless, having to have his brothers pay him forward for putting them as beneficiaries on his life insurance policy for cash and living with his sister who is a nurse in Seattle area. Forgot to mention, his wife was his business partner.