Mary and Janine both have a rather big, shared secret that Magnussen knew about. However the difference between them is that when they were confronted about this Janine started working as his secretary/ body guard to keep him quiet. Mary on the other hand tried to kill him.
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"Uncle Sherlock" is EXTREMELY protective of Baby Watson. Whenever she brings her dates to meet him, he deduces all of their flaws and secrets in front of her. John and Mary have told him off for this, but Baby Watson secretly appreciates it. If he's not good enough for Uncle Sherlock, he's not good enough for her.
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Mary's secret tattoo is the Black Lotus mark on her foot, and she worked as a smuggler right before meeting John.
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Both Sherlock and John have read what was on the memory chip and know Mary's past.
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Harry wasn't at the wedding because having your brother marry your ex wife is really really really awkward.
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Random Sherlock Oneshots
Fanfiction"I know this is a bit stupid. But..... Happy Birthday Sherlock........... I know this was a waste of time...... Why would I say happy birthday to a grave?" -John Hamish Watson