John's missing a sibling and hopes Sherlock realizes how lucky he is to have an older brother who cares in his life.
Most of All
"So who's who here, hmm?"
Sherlock waved broadly. "If you want details, I could give you a list of names, but it would be quite tedious and you're not going to meet all of them anyway."
"I'm not?"
"No. There's too many. I only get to spend time with a portion, so I try to give that portion the quality time they deserve."
"We'll make time," said John enthusiastically. "…You really love your family- I've never heard you say that you'd give anyone 'the quality time they deserve.'"
"Yes. Except Mycroft."
"I think you love Mycroft most of all."
Prompt was from Javien Deluke, and it was: "We'll make time."