I guess I don't see the issue. They aren't in any way related, and it's not like they were raised as step-siblings. Let your mom have some happiness too!

I get the feeling all the NAH replies are coming from young people the same age or near the OP. So many people willing to deny the mum the right to find love just because it upsets her daughter's sensibilities is weird. There are no blood relations or incest going on here and the 2 parents have found each other through having things in common that matter to them and give them good reasons see each other as more than just a fling, that's how most people find love, by getting to really know another and discovering they like them a lot. It's how the OP and her boyfriend found love too going to school together etc. You can't expect the parents to walk back their feelings without cheapening the feelings of being in love in the first place for everyone. Arbitrary rules that keep 2 consenting adults apart are just wrong and even cruel. Love is rare and either of the adults could be alone and heart sore the rest of their lives because of their adult kids behaviour.

I gotta laugh at the person who said the mom could've dated a billion other dudes. That is definitely not the reality of divorced single parent dating. It's rough out there. That said, kind of a jerk move prioritizing a 5 month relationship over a 4 year one just because the daughter and her boyfriend are young.

Reddit is weird in that they reflexively empathize with OP without any rational thought. OP's mom is entitled to her personal life, and it's none of OPs business. OP is the a*****e, although her mom's attitude about OP's relationship is not fair. So ETAH?

My niece's father married a nice woman - not my sister. When my niece was old enough, she was looking for a husband and her father said that she should meet his wife's son (he lived in a different city) because he thought they would make a nice pair. They ended up going on a blind date, they really liked each other, got married, got a kid. I don't see a problem here. They were not brought up together, never lived in the same house and they are not blood related. Why the fuss about this one? A shock, maybe at first, but keeping a grudge and embarrassing them for being together weren't the greatest ideas. The mother, on the other hand, should not have belittled their children's relationship; it's been 4 years.

I can understand it's not wrong, but it doesn't exactly feel right either. Let's imagine for a minute the parents' relationship outlasts the children's. I'd sure as heck hate to have special events with my ex first love forever. Especially if it ends roughly. And if the parents have a child, we have the same half sibling. The potential here for a mess is pretty high. That being said, the daughter was really disrespectful in her handling of it.

The correct answer is ETA. EVERYONE. A. I think perfectly fine the parents are dating. They're single. Who cares! B. Mommy dearest is the A for dismissing their now-4-years relationship. C. OP is the A for flipping out and embarrassing mom needlessly. Everyone needs to take a chill pill and be a grown up.

My MILs father lives with/dates my FILs mother. It's always funny when we talking about my boyfriends grandparents, as these both are the only ones still living. no one ever had a problem that they are a couple.

I think OP over reacted, they are two consenting adults. Also a 5 month relationship is more than just f*****g.

It's a little different and you may need to move to West Virginia (sarcasm/joke) but what can you do? Your mother is the AH for denigrating your relationship.

This is almost exactly the plot to Marmalade Boy.

We only have the OP's side here and I take it with a heaping of salt. She sounds a bit immature, even for being 19. I wonder how many comments she made before her mom made the comment about their "young" love. Sure, she probably shouldn't have said it but few modern high school sweethearts make it to marriage or through the early 20s. I probably wouldn't have said that but from my experience of mine and my sister's teen years, I'm sure there was a lot of instigating. They all handled that situation poorly, the daughter didn't make her case very well with her behavior. If everyone around you is siding against you than you are either being an AH or are dealing with a toxic person who has tricked everyone else.

Much ado about nothing, imo. I can't even understand what the problem is.

to all the YTA : the mother is going to have a child that is related to both OP and OP’s BF. and she is saying that a 4 year relationship won’t last. she seems narcissistic hope OP cuts contact