How to understand strew here
A year after my father told us that story, we gathered one evening to hear him read aloud from Isaiah, a prophecy about Immanuel. He sat on our mustard-colored sofa, a large Bible open in his lap. Mother was next to him. The rest of us were strewn across the shaggy brown carpet.
That doesn't make sense if it is a passive sentence, I mean no one actually strew them, right? Then, what does it mean?
It means that they were sitting around in random positions (like a handful of objects that have been scattered), as opposed to sitting in a row, for example.