Over the last few decades, it's been increasingly understood that a family can take on a lot of different forms that can mix and match depending on where life takes its members.
But while this makes it clear that we can have a wide variety of "normal" families, we can also discover as we go through life that things we become used to within our families aren't always as universal as we might expect.
And when someone tells us about a living arrangement that we've never heard of before, it's hard not to get a little curious about how it works.
That might have something to do with why at least five million people have found one "blended unblended" family so fascinating.
