Courtesy lookup - not my family.
Ira William KILMON/KILMAN was born 7 March 1890 Cople, Westmoreland, and George Washington KILMON/KILMAN was born 6 Dec 1893, Cople, Westmoreland. They are both sons of Ira William KILMON, Sr (born April 1862, Accomac Co, VA) and Martha "Mattie" BARNETT (born Oct 1861, Westmoreland). Ira W. KILMON and Martha BARNETT married 23 April 1885 Westmoreland Co., VA.
Richard KILMON was born 11 March 1872, Accomac Co., VA, the son of Ellis and Rachel KILMON. Richard married 3 June 1897, Westmoreland Co., Florence SMITH.
Ira W. KILMON, Sr. born 1862, Accomac, also had a father named Ellis, so I believe Ira Sr. & Richard may be brothers. That would make Ira William and George Washington nephews of Richard & Florence.
Hope this helps!