I've been wondering whether Shirley is Mick's mum since January or February. It was just this one scene. Mick was sleeping on the sofa in the lounge, Shirley came in, pulled up the blanket round his shoulders, and then - stroked his hair. Not like a sister would, but like a mother would. But then I saw people saying on DS that it was a ridiculous rumour, and would never happen.
To be fair, it could be slightly different from the Kat/Zoe story if Shirley conceived the baby willingly (ie she wasn't raped.) But then it would be similar to the Ronnie/Amy story, and wasn't DTC part of the team who did that?
But next week, it says Mick and Shirley decide to move on. How could Mick move on from being drowned by his sister, or that his sister is realky his mother?