Welcome back ladies and gentlemen of the internet. When you're young and in love, everything has the air of ease and euphoria surrounding it. Planning date nights, going on long walks together, and meeting each other's parents can make life seem like a dream. Time goes by, and after years of being in love, you decide to get married. Life is encapsulated in a perfect world that you didn't know you could exist in.
Now take the same scenario and add children to the mix. It doesn't quite have the same tranquil scenery attached to it. Children can complicate things, and having children from different partners can complicate things even more.
This brings us to the Reddit thread. In this story, the original poster (OP) is a man whose fiancée has a daughter from a previous partner, and he has a son from a previous partner. It's been fine for their nearly four year relationship, until one day it isn't, and he says the wrong thing.