I can't remember either of mine doing it. DD was a real chatter box but she didn't give a constant running commentary on her games.
We do play with the DGC when they're here but if oldest (5) is playing by himself he will tell you all that's happening. "The helicopter is going to rescue the man 'cause he's trapped. He's taking off now, he's flying over here (helicopter held aloft and running) now he's going to land, now he's going to........"
Do your DGC do this ?
I find it very wearing [sigh]
Army horses loose on London streets