Let me throw in the oft-ignored concept of decriptive. If the greengrocer owns the shop, it's the greengrocer's shop. If the baker owns the shop, it's the baker's greengrocer shop (or greengrocery) Although these days, more likely, it's the produce aisle at Safeway ;o)

So where does that leave us with Mothers Day?

And should you be doing something to promote world peace instead of fretting over apostrophes?