He was educated at Eton College (1728-32) and studied law at the Inner Temple, where he was called to the bar in 1738.
[1] In 1738 he inherited Butleigh Court, Somerset from his aunt Catherine Riggs née Symcox.
He later oversaw the reconciliation between George Grenville, who had caused a rift with his family by not resigning, and their eldest brother Richard Grenville-Temple, 2nd Earl Temple a close ally of Pitt.
[4] He married Mary, the daughter and heiress of James Smyth of South Elkington, Lincolnshire and with her had twin sons.
He was succeeded in 1783 by his son James, who received most of his estate and was later created Baron Glastonbury, although some property also passed to the younger twin General Richard Grenville.