January 31
There is no official national nephew's and niece's week in the US. Nor is there a specific day in the year where niece's and nephew's are celebrated.
Then 45th week of 2011, falls on November 5 2011.
National Brother's Week was the week of July 10th, 2011.
There were 260 week days in 2011.
14th week 2011 is 27 March to 2 April 2011.
Genesis Week - 2011 was released on: USA: 27 July 2011
News Week - 2011 was released on: USA: 13 May 2011
I have three nephews.
The plural of nephew is nephews.
29 May to 4 June is week 23 of 2011.
Nephews is a plural noun.