Yeah, some kids don't even know a single happy couple, anymore. If they want to have that, they have to completely guess about how to do it, or read magazine articles, or hope that their other half has a clue and can help them. Everything they know is basically hear-say.
You can actually see this online, with people going overboard on some sort of fairytale-perfect social media family stuff. Real-life married families are more complex, but they don't know any.