Mrs Hudson.
Most people would think that Sherlock and John or her husband would be the most memorable person for Mrs Hudson. Her husband especially. They were not though. The person Mrs Hudson will always remember was her niece Lily, who died when she was 8. She was a bright young thing with brown hair and green eyes and masses and masses of freckles. She had that cheeky smile that most children have and she was a ray of sunshine.
Mrs Hudson will never forget the day that made her sadder than she'd ever been in her whole life. One day when Lily's mum had gone home for a shower, lying in bed really ill, those lovely brown curls gone, skin an odd colour and slightly bloated from treatment, Lily turned to her only and favourite aunt.
"Auntie?"
Mrs Hudson looked up from her magazine.
"Yes Lily?"
Lily stared into her Aunt's eyes with eyes older than herself.
"When I die, you'll take care of mummy right?"
Mrs Hudson was shocked.
"Don't be silly Lily, you're going to get better"
Mrs Hudson put her magazine down and stroked Lily's hair, giving her a soft smile.
"You're going to be a writer remember? The best one the world's ever seen"
Lily gave her a stern look.
"You're the silly one. You know I'm dying"
Mrs Hudson shushed her.
"Don't say things like that"
"I am dying. I don't see why I should say anything else. Just promise me though, promise me to the moon and back that you'll take care of mummy"
Mrs Hudson, who was not one for crying, found that her eyes were starting to fill with tears.
"Yes darling, I promise I'll look after mummy"
Lily gave her famous cheeky grin, her eyes sparkling like the old Lily who was able to run around. She died later that night.
Her mother followed a year after from a broken heart.