I am trying to understand correctly... your aunt and uncle are step- bro and sister... but if they were adopted by the parents or vice- versa. Wouldn't they still be family even if they aren't completely blood related? I mean if the care about you it shouldn't matter. Sorry

OP here (I didn't hook my email when I orginally submitted)

To clarify, my aunt and uncle were married with kids before they became step-sister and brother. My grandmother died (my uncle's mother), and coincidentially my aunt's mother had been widowed for some time. My grandfather (my uncle's father) married my aunt's mother. I just still think it is hella weird, but we just joke about it when we meet around for the holidays.

OP here (I didn't hook my email when I orginally submitted)

To clarify, my aunt and uncle were married with kids before they became step-sister and brother. My grandmother died (my uncle's mother), and coincidentially my aunt's mother had been widowed for some time. My grandfather (my uncle's father) married my aunt's mother. I just still think it is hella weird, but we just joke about it when we meet around for the holidays.

If they aren't blood doesn't matter.

it kinda does matter. blood isn't the only thing that defines family. if people become step siblings when they're both in their teens & didn't spend many years living together then that might be different, but if step siblings have grown up for a lot of their life together & then date, then imo that's the same as 2 blood related siblings dating, aka creepy af.

In your opinion though. Your opinion isn't what matters here. You may think it's disgusting and vile, but in terms of Law, if they aren't blood, it is NOT incest. They have blood laws because of deformities. that's the ONLY reason, you can't marry your blood related family. It has nothing to do with it being disgusting. 

They don't call it, "Kissing cousins for nothing".

Sweeet home Alabama!

Are you hearing banjo music in the background?

Does it really matter? As long as they aren't related by blood everything is fine.

Alabama or Westeros?

I'm confused. In what other way are you related to your cousins?

op might be related to the cousins through both his father and mother.

OP here (didn't hook my email so you are just going to have to trust me on this)

The aunt and uncle's kids from this post are NOT the ones my brother and mom were talking about. This relationship is more towards my dad's side of the family. I have a pair of first cousins that are also my third cousins through my mother and their father (my uncle). The small town my mom and dad both grew up in have around 1000 people so pretty much everyone is related.

Maybe "double first" cousins? I know of a brother/sister marrying a sister/brother, so all of the children were cousins on both sides of the family.

I had an aunt and uncle who were stepsiblings before they married. They met and were getting serious and his dad met her mom and they fell in love and got married before my uncle and aunt married.

Grandpa and grandma are still going strong, but my uncle divorced his wife. Grandpa and grandma's favorite thing to do is try to trick people by saying that he has 15 grandkids and she has 9, and asking people (usually grandkids SO's) how it's possible that together they only have 20. Answer

 This happened to a friend of mine, both her and her husband had lost a parent to cancer. Her mom and his dad meet thru their children.  Now they have been married 10years, step siblings about 6years.