( CNN ) -- Former President George H.W . Bush released an updated version of his book , `` All the Best , George Bush ; My Life in Letters and Other Writings , '' in which he talks about how he had to keep himself in check while his son George W. Bush faced criticism while in the White House . `` My heart went out to him , '' the 41st president wrote of the 43rd . At the same time Jeb Bush , a former two-term Florida governor and possible 2016 presidential candidate , also released the book he co-wrote on the immigration debate , `` Immigration Wars . '' Here 's a look at the Bush family , by the numbers : . 2 : Presidents whose sons later became president : John Adams and John Quincy Adams , and George H. W. Bush and George W. Bush . 444 : The estimated number of people in the United States named George Bush , according to the How Many of Me.com website . 3 : Members of the immediate Bush family named George . In addition to George H.W . and George W. , George P. is Jeb Bush 's son and a managing partner of an investment firm in Fort Worth , Texas . 6 : Number of children George H.W . and Barbara Bush had : George W. , Robin , Jeb , Neil , Marvin and Doro . Robin died of leukemia as a child in 1953 . 17 : Number of the Bushes ' grandchildren . 3 : Living members of the Bush family who graduated from Yale University -- George H. W. ( '48 ) , George W. ( '68 ) , and George W. 's daughter Barbara ( '04 ) . 2 : Times brothers George W. and Jeb Bush were each elected governor . George W. Bush was governor of Texas from 1995 to 2000 and Jeb Bush was governor of Florida from 1999 to 2007 . 65 : Percentage point drop from George W. Bush 's highest presidential job approval weekly rating ( 90 % ) in 2001 to his lowest ( 25 % ) , which was recorded three times in Gallup 's weekly poll in October and November 2008 . 60 : Difference in George H. W. Bush 's highest and lowest job approval ratings : 89 % in February 1991 and 29 % in July 1992 . 60 : Types of endangered species whose habitats were saved during the Florida state program to clean up the Everglades , which was launched while Jeb Bush was governor . 12 : Age of George W. Bush 's Scottish terrier , Barney , who died from lymphoma in February 2013 . While he was `` first dog , '' Barney appeared regularly in online videos made by the White House Communications Agency . 4 : Trips to Iraq while in office by George W. Bush after the war there began in 2003 . 3 : Strands in former first lady Barbara Bush 's trademark pearl necklace . 48-3 : Score in the most recent football game ( September 2012 ) between Texas A & M University , site of the George Bush Presidential Library and Museum , and Southern Methodist University , where the George W. Bush Presidential Library and Museum will open to the public on May 1 .
6 - Number of children George and Barbara Bush had . 3 - Living members of the Bush family who graduated from Yale University . 4 - Trips to Iraq while in office by President George W. Bush after the war began .