In reply to benp1:
> I'll just be doing outdoorsy activities and normal holiday stuff (in a cold location)Toboganning, dog sledding, snowmobile, walking around etc.
Your boots will be fine. Often for those kinds of activities, especially the snowmobiling and dog sledding you will be provided with an oversize (think one-size-fits-nobody) suit and snow boots.
The only disadvantage would be, if as wbo says, you are standing around in -20 or 30 at night, Northern lights spotting or somesuch. Boot warmers are ideal, but if you do end up mooching about or postholing around a forest then gaiters would be an excellent and relatively cost effective addition to keep your boots dry and your feet warm.
As for your wife, her boots should be fine, boot warmers and felt insoles will also be useful too if she feels the cold easily. Additionally lots of chocolate and expect to relinquish your down jacket to her
As the old saying goes; if your feet are cold, put on a hat.