My DS (4.6yrs) has just asked if I'll die when he's an adult. He said that if I died he'd be very lonely. Heartbreaking!!!!! 
We were just having dinner and I was knocked sideways as it came out of the blue. I have 3 siblings so I guess I'm having one of those 'guilty' moments about not having another child. My DP and I are 45 and we feel like the three of us are a nice little unit. Even my DS says 'Mummy, you're mine, all mine!' so I'm assuming he doesn't want a sibling!!!
Anyway, feeling very tearful about it so thought I'd share.