A sudden chat-realization, put here mostly to bring it to Becca's attention if she hadn't thought of it, because it might come up in the William-Mal-Vimes thread:
delicfcd: ...Vimes is post-Thud
delicfcd: so... chances are, if William's married in his timeline...
delicfcd: he would know
Malamanda: oh man.
delicfcd: ohhhh I did not think of that
Malamanda: ........oh ma.
delicfcd: ah, but he also knows when William's from
Malamanda: true that
delicfcd: so he'd be able to figure out the 'from before marriage' thing
Malamanda: MENTION THAT TO BECCA