Sherlock and Joan | so show me family

They left Gregson's office holding each others hand and found Oscar sitting in the corridor.
'Holmes, what's going on I've been here for almost two hours.'
'They haven't told you?'
'Told me what?'
Gregson and Bell appeared from round the corner.
'Sherlock, can we have a word with you and Oscar for a moment?'
Sherlock gave Joan a kiss on the cheek and followed them into one of the interview rooms.
'Now, Oscar we have decided not to charge you but only if you help us catch your dealer.'
'What? I've already told you i'm not telling you anything, if he finds out it was me i'm dead. You've seen the others.'...

Set a couple of months after the trial

As Sherlock sat, waiting for Joan, he thought about the past couple of years. His relationship with Joan has gone from strength to strength, sure they've had their moments but what couple hasn't? He has a beautiful baby boy, who he adores so much and his relationship with his father has gone from none existent to rebuilding. And now he's here.

'Sherlock?' He snapped out of his trance. 'You ok?' He looked up to see Joan standing with Joesph.
'I'm fine. Just thinking.'
'What about?' She sat down next to him.
'Life.'
'Sherlock..' She took his hand in hers. 'It's...

Sherlock woke the next morning, Olivia was lying asleep beside him. He got up and went downstairs, no sign of Oscar or Micheal. He took out his phone and dialed Joan's number.
'Sherlock.'
'Morning Watson.' He heard Joesph in the background. 'He's up early.'
Why do you think i'm up?'
He laughed.
'I miss you.'
'I miss you too.'
He took a deep breathe.
'I have to tell you something.'
'What?'
He looked out the kitchen to make sure Olivia wasn't up.
'I've figured out a way to get closer to Micheal.'
'But?'
'But it involves me and Oscars sister.'
Joan went silent, she held the phone against her chest imagining...

They both sat in Gregson's office as they questioned Oscar about the drug dealer, they hadn't said a word to each other since leaving the brownstone. Sherlock could tell when she was annoyed with him, he had seen that look many times. He moved closer to her and buried his face in her hair.
'Joan, please, talk to me.' He kissed her shoulder. 'I'm sorry.'
She sighed.
'I know you are, but you've been keeping more secrets from me first it was Irene, then your brother now this. How many more can i expect?'
'No more.'
'You sure about that.' He placed his forehead on her shoulder, not wanting to look in...

Sherlock saw at least 3 different exits from where he stood but all were to far to hatch an escape attempt that wouldn't involve a casuality. He knew what is was like to be shot but didn't want to experience it again. He checked his watch it was ten to eight, he needed to send a signal to Gregson but how? He looked round him for something that could help, he noticed a button the right hand side of the wall which could be the buildings old whistle to alert the men work was finished. But getting to it would prove to be a challenge.

'Which one of you is lying?'
'Micheal we've been doing buisness...