No, James Arness is not single.
Yes they were brothers
Jenny Karezi was born in 1932, in Athens, Greece.
James Arness went by Jim.
Jenny Maki was born on April 23, 1964, in Los Angeles, California, USA.
Jenny Lee Arness died on May 12, 1975, in Malibu, California, USA of suicide.
James Arness (May 1923 to June 2011) was the American actor who played Marshal Matt Dillon in the television series Gunsmoke. Arness had four children, Rolf, Craig (deceased), Jim, and Jenny Lee (deceased).
Jenny Lee McKenzie was born in 1969, in Price, Utah, USA.
Jenny Lee Smith was born on 1948-12-02.
Jenny Lee-Wright was born on 1947-02-21.
Jenny Lee Snow was born in 1912, in Hartwell, Georgia, USA.
Jenny Lee Wright was born on February 21, 1947, in London, England, UK.
Andy Arness was born on December 31, 1959, in Everett, Washington, USA.
James Arness was born on May 26, 1923
James Arness was born on May 26, 1923.
Jenny Lee Snow is 4' 4 1/2".
Jenny Lee Snow went by The pinhead twins.