*marry
In Japan it’s not that unusual to have a marriage between cousins, but nowadays it’s less common
Marriage between cousins are very common in many countries across the world. Not to be rude, but it's mostly Americans that have a really large problem with it. (that's how it's portrayed in social media. I'm sorry if I'm wrong!)
Not only americans, it’s not very common in most countries as it can be really unhealthy for the lineage when children are born from 2 close family members
As far as I know Marriage between cousins isn't that common anymore xD children born from incest do have a lot more chances of having certain disabilities and such.
Aside from that marriage between relatives was a thing some time ago to "preserve" the lineage or something xD
He explained at the start that their families would marry each other for centuries to preserve their powers so I guess that they could even be first cousins but it's not like they'd give a sh!t or two about it
It's the disabilities that I was concerned about
Wait that means that Yuri is Rio's close cousin?! And if they had a son he would his cousin too........