All my life I have worked at small family owned businesses. From my first job to this one, if I have a problem or need to talk about any issue I know exactly who to talk to.
At the photolab where I worked for over 25 years the boss was the man that started the company. Like many family businesses he "hired" his wife to work there. Of course as the bosses wife she figured she was a instant expert. She was a dump aunt, (I miss spelled aunt, it is supposed to start with a different letter) and tried to tell me how to do my job and was flat wrong about the procedures to produce a good product. After just a few weeks I went to the boss and closed the door. I asked him point blank who was the ultimate boss. He was.
I explained what his wife was trying to instruct me to do. He said to just ignore her. I took that literally. I just ignored her completely and did my job in the proper way. I went for years without speaking to her except to request she move out of the way so I could do my job. She would get so pissed she would go home and we all cheered. She always came back the next day.
Finally she became a grandma and stopped coming to work to stay home and take care of the kid. It was great.