Just curious, what happens now that the deadline has passed and the property settlement is not done? What are the options? What are the repercussions? Who bears the greater risk of loss in this scenario?
I suppose I would allow that to be the deciding factor in whether I did the mop up for him. If I had the consequences, I would just see that as looking after my own interest. If he did, I would say, oh well, your loss, do it when you want/or must/or can.
