Maybe they read them out loud to each other, or they listen to the audiobooks together. Or perhaps they each independently have a copy so they can read at the same time, or they just share the same one copy and read it when the other is not.
Maybe they read them out loud to each other, or they listen to the audiobooks together. Or perhaps they each independently have a copy so they can read at the same time, or they just share the same one copy and read it when the other is not.