I know the snow was bad. We were snowed in for a week. But my MiL has yet to appear because apparently it's too snowy where they are. And yet friend who lives a mile away says 'nah it's fine, I've just driven back from Newcastle and it's absolutely fine - the roads are all clear' 
I cannot plan my week in case they decide to honour us with their presence. DH is silently fuming and refusing to talk to them in case he yells and the kids want to know why there are presents under the tree they can't open yet (because they go with the things MiL has got them - ie we've got a train track and she's bought the sodding train).