In 1758, as Treasurer of the Navy, he introduced and carried a bill which established a fairer system of paying the wages of seamen and supporting their families while they were at sea which was praised for its humanity if not for its effectiveness. He remained in office during the years of British victories, notably the Annus Mirabilis of 1759 for which the credit went to the government of which he was a member. However his seven-year-old son died after a long illness and Grenville remained by his side at their country house in Wotton and rarely came to London.