KHolly asked what I wish someone had told me when I was 7 and 14, that I'm making sure the boys know now...
That's a hard one. I've sort of answered a part of that before, slightly, in regard to relationships.
But otherwise... I think, when I was 14, I probably needed someone to tell me I wasn't an adult. No matter how much I thought I was, or had to be. I wasn't. I was still a child. Albeit with maybe more responsibility than many. I wish someone had told me that. I wish someone had been there so I didn't feel like I had to be responsible. And I hope that Mycroft, now, is only as responsible as he wants to be, and lets John and I help out with all the times he doesn't want to be.
As for being 7...I don't remember that much about being 7. Probably needed telling that I was, actually, a mortal being. And that negotiation was more effective than arguing. But I hope a lot of the advice I'd give myself was completely irrelevant to Sherlock, because his life, is, I hope, very different to mine.
I don't know. I still barely feel qualified to be raising another human being, let alone offering sage advice.