I think I mentioned some stuff about John's family in earlier chapters; does anyone remember?
What Christmas Used to Be
John's frustrations with his family had never beleaguered him so much as they did now with Sherlock's curious gaze on him.
However, he was beginning to find that there was no one he trusted quite like Sherlock, so he wiped his mouth with a towel and said in a rush, "My mother's a drunkard who forgets me, my sister's depressed over failing relationships, and my father walked out on us when I was ten. We don't really have extended family, so Christmas was my weeping sister and my piss-drunk mother. Of course I said yes to coming with you."
Prompt was from Javien Deluke, and it was: beleaguer (I used one of the words from the Challenge List!)