www.google.com showed a picture of a sheep in its logo, so I clicked on it. Well, wouldn't you? 
Anyway, it did a search for Mother's Day and says:
What calendar are they using? 
Anyway, it did a search for Mother's Day and says:
Search Results
Mother's Day — Date: US Mother's Day is Sunday May 9, 2010
According to http://en.wikipedia.org/wiki/Mother'...(United_States)
Mother's Day - Wikipedia, the free encyclopedia
The modern Mother's Day is celebrated on various days in many parts of the world, often in March - though more commonly in May, as a day to honour mothers
...
Mother's Day — Date: US Mother's Day is Sunday May 9, 2010
According to http://en.wikipedia.org/wiki/Mother'...(United_States)
Mother's Day - Wikipedia, the free encyclopedia
The modern Mother's Day is celebrated on various days in many parts of the world, often in March - though more commonly in May, as a day to honour mothers
...
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