I am often amazed during occasions where family members appear for professional socializing (networking event, holiday event, being invited into homes with family hosting etc.)
In my experience most reasonable people don't try to show off that they are family (cousins, children, nieces and nephews) introducing each other into working for the same company, or networking for each other's gains. But there are people who are unaware their family better stay out of professional connections. I often think if people are not successful or respected enough, they shouldn't show their family to their professional circle.
It amazes me that they have family who are stuck with them. A-holes who are not honest about money, have behavioral problems, incompetent people who have more failures than successes under their name, people who waste other's resources more than they earn, people are not intelligent to have a real solution to problems but got a network and use job changes to get a title upgrade, etc.
You can tell the family members have a variety of attitudes. It can range from they are just trying to get the networking over with, or the family members can try to kiss up to others so their spouses/kids/relatives can get a better professional standing and look good on the surface.
I have seen parents that are sort out helicopter parents who appear at job interviews and made inappropriate remarks at the reception. And that child doesn't have a great shot to begin with, who also has attitude problems.
I have seen an outsourced contractor whose behavior were erratic. Turned out both his wife and him have addiction issues. The only thing is that the wife is clueless about, is that the guy is going to get fired. Bringing a wife at an event is awkward, as others try to hide the fact that he will be fired.
I recall there is a guy in the office who tried to solicit women for affairs at work and he was not discreet about his pursuits (that's how much of an idiot he is.) He just blatantly brings his wife over for a company event. He directly introduced his wife towards a group of people including those who he tried to have affairs with. We felt bad for his wife.
I have heard racist slurs from a person at a “social” job doing PR and marketing for an international market, that easily contains people of different races. The person is very two faced. It makes me think his family must be tricked by him.