It probably says something that Abby is the second most mature person in the room.

She's a Sherlock-wrangler in training, she'll be learning from the best.

I like how Mycroft manages to still be Mycroft and yet deal well with children.

He was naturally very good with Abby. In my version with the three brothers, he immediately took over the role from Q, which was not how I had planed it to g

I like your Mycroft. He's so unflappable.

Thank you! He grew up with Sherlock, I'm sure he's seen it all.

Thanks for commenting, lovely!