Okay let's take two people Jim and Sarah. Jim has one brother and Sarah has one sister. When Jim and Sarah get married, Jim's brother is Sarah's brother-in-law and Sarah's sister is Jim's sister-in-law. The only way this normally happens is if two families merge like with a step-parent. It seems that all four of them become interrelated making Jim be Sarah's brother-in-law making all marriages incestuous as they are essentially step-siblings.
they're married how can it be incest, is what I meant
Okay let's take two people Jim and Sarah. Jim has one brother and Sarah has one sister. When Jim and Sarah get married, Jim's brother is Sarah's brother-in-law and Sarah's sister is Jim's sister-in-law. The only way this normally happens is if two families merge like with a step-parent. It seems that all four of them become interrelated making Jim be Sarah's brother-in-law making all marriages incestuous as they are essentially step-siblings.
I'm uploading my brain to FS the first chance I get! :D