Only one sibling survived childhood, Paula (1896-1960). Four siblings died in childhood: Gustav (1885-1887), Ida (1886-1888), Otto (1887), Edmund (1894-1900).

Yes. 1) "Alois Hitler (born Aloys Schicklgruber June 7, 1837 – January 3, 1903) was the father of Adolf Hitler." "Spouse: Anna Glassl Franziska Matzelberger Klara Pölzl Children: Alois Hitler, Jr. (January 13, 1882 – May 20, 1956), Angela Hitler (July 28, 1883 - October 30, 1949) Gustav Hitler (1885 - 1886) Ida Hitler (1886 - 1886) Otto Hitler (1887 - 1887) Adolf Hitler (20 April 1889 – 30 April 1945) Edmund Hitler (1894 - February 2, 1900) Paula Hitler (January 21, 1896 – June 1, 1960)" http://en.wikipedia.org/wiki/Alois_Hitler 2) "Alois Hitler, Jr., born Alois Matzelsberger (January 13, 1882 in Vienna – May 20, 1956 in Hamburg), was the son of Alois Hitler and Franziska Matzelsberger and the half-brother of Adolf Hitler." Source: http://en.wikipedia.org/wiki/Alois_Hitler%2C_Jr. 3) "Angela Hammitzsch, born Angela Hitler (July 28, 1883 - October 30, 1949), first married to Leo Raubal, Sr., was the elder half-sister of Adolf Hitler. She was born in Braunau, Austria, the second child of Alois Hitler and his second wife, Franziska Matzelberger. Her mother died the next year. She and her brother Alois Hitler, Jr. were raised by their father and his third wife Klara Pölzl. Her half-brother Adolf Hitler was born six years after her and they grew very close. She is the only one of his siblings mentioned in Mein Kampf." Source: http://en.wikipedia.org/wiki/Angela_Hitler 4) "Edmund Hitler (1894 - February 2, 1900) was the younger brother of German dictator, Adolf Hitler. Edmund was the fourth child of Alois Hitler and Klara Polzl. Of the couple's six children, only two would survive infancy. Edmund's older brother and sister, Gustav Hitler and Ida Hitler, died in 1886 of diphtheria. Otto Hitler, the couple's third child, died in 1887 shortly after birth. Edmund Hitler, one of only three surviving children by 1900, died of measles on 2 February 1900. Edmund's younger sister, Paula Hitler, would be the only member of the family to survive World War II." http://en.wikipedia.org/wiki/Edmund_Hitler Moreover: "In the late 1860s, he fathered an illegitimate child with a woman named Thelka (or perhaps Thekla) whom he did not marry and whose family name is lost to history." Source and further information: http://en.wikipedia.org/wiki/Alois_Hitler 5) "Paula Hitler (January 21, 1896 – June 1, 1960) was the younger sister of Adolf Hitler and the last child of Alois Hitler and his third wife, Klara Pölzl. Paula was born in Hafeld, Austria, and was the only full sibling of Adolf Hitler to survive into adulthood." Source: http://en.wikipedia.org/wiki/Paula_Hitler

Yes, he had an Uncle Joe who lived in Russia.

Hitler had a half-brother, who married an Irish woman and they ahd a son whom I believe is living in New York.