Because those one million people weren't his family.

*squee*

Ahhh, it’s wonderful to see all the little differences between Mycroft and Sherlock at this age, how Mycroft is easier to accommodate to Siger and how Sherlock is more similar to Dora. I doubt Mycroft ever got lost on the beach or went somewhere he wasn’t supposed to.

And I agree, a family that keeps their beach house stocked with a full encyclopedia set must be a good one! :)