Sherlock snorts, but it's more amused than dismissive, and it's clear to Joan and Ted that he's pretty chuffed by the "weird uncle" designation.

Joan takes the arm as invitation and leans against Ted with a quiet sigh. It's good to feel that little glimmer of happiness. It is far too easy within grief to believe you'll never be happy again, even if intellectually you know it's not true. Now she has solid proof that she can still be happy, that the pain won't last forever. It's also so good to be thinking a little further down the road. It means there's a future beyond this time of hardship, yes, but it also reassures Joan that her relationship with Ted is solid, despite their argument still being so fresh.