He was born in 1804 in
Jamaica Plain, Boston, Massachusetts, to Ralph Bennet Forbes and Margaret Perkins, sister of the trader in
slaves and China
opium,
Thomas Perkins. His brothers were Thomas Tunno Forbes and
John Murray Forbes. On October 19, 1817, at age 13, he joined the crew on his uncle Thomas'
Canton Packet and made his first voyage to China, the first of the three brothers to do so. He arrived in
Canton, China in March 1818 via the eastern route. He returned to
Boston three months later. In 1819, he made a second voyage aboard
Canton Packet. On this voyage, he was promoted to third mate. He became second mate in 1821. ==Ships' command and Far East trade==