I have a 9yo talker and it has eased up a bit since she was 4. She'd narrate everything she did back then, down to a progress report on what the poop is doing when she's on the toilet. THAT has stopped at least, as has narration as she draws - but it didn't slow down until she was about 7. She gets pinged a lot at school for fidgetting and talking. I can't concentrate when I'm driving with her yabbering on either. And of course, she was an early talker so I've been getting this since she was not much past 6 months. The other one is near 18 months behind her in talking stage - and she's the normal one!

Now if she thinks you're in earshot she narrates everything on the TV (and then asks what is happening because she wasn't listening) and talks constantly during dinner about weird stuff, and generally runs into our study (or yells from the next room) very frequently to tell us what she's doing with her little sister and how fun it is or how much she hates her little sister and hates playing with her. At some stage she stopped talking to every random stranger she bumped into about her entire life story and is now "embarrassed" about talking to people to the extent she can't even order lollies from a shop, even if you get nasty and threaten that she can only have lollies if she orders them herself. I'm sure by the time she's a teenager she won't be speaking to me (or anyone else) at all.

Little one is the quiet type. Rarely narrates, so you can't tell what she's getting up to in the next room like with #1 when she was little, so you get little surprises like finding she's silently emptied a tissue box or something. She is more likely to ask us specific questions while the other one just yammered on constantly.