I've had this idea for a while now, only today did I actually sit down and think of what to write for it!
Thinking of what Sherlock has to say (even as a kid) is tough.
He's so damn clever!
And Mycroft is probably more of a teenage-y age here...if that made sense xD
And yes, Sherlock did know John from a young age
In my world ahahaha
I'm sure John's fancy dress party wasn't that bad!
Kid!Sherlock and Kid!Mycroft (c) BBC? O.o