I just watched it last night. This is my theory....
That's seems too easy of a stretch to think it might be the very immediate family. I think anyone that would immediately come to mind would be too easy, that's just MHO.
I think it's the grandfather because he saw how not just evil, but outright cruel Joffrey was and that can't be controlled. I think the grandfather wants someone on the throne that he can manipulate things his way.
All I know is that Anne Bolen, oops, Margaery becomes the new reigning monarch she better not harm Tyron.
OMG what if it was Shae who set this all up, thinking she could smuggle him out while in prison????? We know that she really cares for Sansa, despite everything, I think she would help her to.
Re: I know I'm late to the GoT latest eps.