Cook began working on trading ships in the Baltic Sea. After passing his examinations in 1752, he soon progressed through the merchant navy ranks, starting with his promotion in that year to mate aboard the collier brig Friendship. In 1755, within a month of being offered command of this vessel, he volunteered for service in the Royal Navy, when Britain was re-arming for what was to become the Seven Years’ War. Despite the need to start back at the bottom of the naval hierarchy, Cook realised his career would advance more quickly in military service and entered the Navy at Wapping on 17 June 1755.
Cook married Elizabeth Batts (1742–1835), the daughter of Samuel Batts, keeper of the Bell Inn, Wapping and one of his mentors, on 21 December 1762 at St. Margaret’s Church in Barking, Essex. The couple had six children: James (1763–94), Nathaniel (1764–80, lost aboard HMS Thunderer which foundered with all hands in a hurricane in the West Indies), Elizabeth (1767–71), Joseph (1768–68), George (1772–72) and Hugh (1776–93), the last of whom died of scarlet fever while a student at Christ’s College, Cambridge. When not at sea, Cook lived in the East End of London. He attended St Paul’s Church, Shadwell, where his son James was baptised. Cook has no known direct descendants—all his recorded children either pre-deceased him or died without issue.
*All details taken from Wikipedia for educational purposes only.