Mycroft Holmes: This is a private matter.Sherlock Holmes: John stays.Mycroft Holmes: This is family.Sherlock Holmes: THAT'S WHY HE STAYS!
We are in Buckingham Palace, the very heart of the British nation. Sherlock Holmes, put your trousers on!
I mean, obviously, "normal" and "fine" are both relative terms when it comes to Sherlock and Mycroft.
I wrote my own version of the Nativity when I was a child, "The Hungry Donkey". It was a bit gory, but if you're gonna put a baby in a manger, you're asking for trouble.