BBC, John once married a woman who had a lot in common with Sherlock

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As the title, John once married and had children with a woman who had a lot in common with Sherlock. Actually, Sherlock introduced her to John, when they already knew there's something between them but unwilling to change anything.

But that was more like a background setting of the story. At the present in the story, John had already broken up with her and got together with Sherlock. The three of them were still friends with each other. The story was told by John's daughter, I think?

Anyone? Please?

Can't remember the plot clearly enough to tag, will fill the right tag when the story is found!

ETA: FOUND. :)
The Blog of Eugenia V. Watson by madlori