Peebles in Illinois from England

I'm currently researching this family who immigrated to the United States in 1856 on the Ship Victoria which arrived in New York on March 24, 1856:

Robert W Peebles born 1821 in Banbury, Oxfordshire, England, died 1859 in Will County, Illinois, buried in Willard Grove Cemetery in Channahon
wife is Ann S (unknown maiden name) Peebles born 1819 in Barford, Warwickshire, England, remarried to an Ira Owen Knapp in 1864 in Illinois, died in Will County, Illinois in 1903, buried in Willard Grove Cemetery

They had two sons:

Charles Edward Peebles, born May 19, 1849 in Banbury, Oxfordshire, England, married Alice Laura Hurin on January 12, 1890 in Illinois, died March 25, 1921 in Channahon, Will County, Illinois, buried in Willard Grove Cemetery. Alice Peebles died Aug 3, 1929 in Illinois, buried in the same cemetery.

Robert Peebles, born about 1850 in Banbury, Oxfordshire, England. Nothing more is known about him.