Here’s a great article on cousins:
https://www.theatlantic.com/family/archive/2023/12/cousin-relationships-fertility-rate/676892/?utm_campaign=atlantic-daily-newsletter&utm_source=newsletter&utm_medium=email&utm_content=20231219&utm_term=The+Atlantic+Daily
My cousins growing up were my exposure to generational wealth (one set) and traditional UMC lifestyle (the other set). I grew up in a struggling household. It was helpful to work through envy as a kid. As an adult, I’m comfortable around people who are dramatically wealthier than me. I am able to treat them as peers and not feel bad or threatened. It also taught me what was achievable in life. In many ways, I credit that exposure to some of my success today.