Oh, come on.. it's not bad at all. They both think of each other as their real spouse instead of their husbands. And they're happy together.
See how they sighs after joking about their husbands. See how the long haired mom says "I'm heading out" instead of "I'm going home". The author even makes it even more obvious by making her says it was a mistake to her daughter. We know it's the other way around.
They could be only realized it after their marriage. Or they could just do the marriage because they have to. Anyway, it isn't bad at all, really. They're happy together, and they love each other. It's works for them.