claraschu I am working from memory here so forgive me some of the details 
He was responsible I think, in a way, for the death of her father hence his son was it? As her benefactor? There was another son who didn't want her to have any of the money, again if memory serves me correct.
They were sending her jewels every month or so (year?) because their father asked them to do so as he was racked with guilt about her father's death.
I am getting Moran and Sholto mixed up - this is Cpt Sholto NOT Moran as I said earlier. I agree, Moran doesn't feature anymore.
In the Empty House Watson made reference to the fact that Holmes knew of his recent bereavement, so it is clear that Mrs Watson was out of the picture, although Doyle forgets this as later on in the stories, there is another Mrs Watson.
He also got Mrs Hudson's name wrong at one point as well as John/James Watson (nice touch in first episode). You can tell his heart wasn't really in it towards the end, he was more focused on otherwordly things, unfortunately.