In 1733, he married a Miss Simondi, the daughter of the Swedish consul at Lisbon by his wife Anne.
She was the sister of Joseph Gulston, and later made a second marriage to John Goddard; both were merchants engaged in Portuguese trade and Members of Parliament.
[1] At the 1747 British general election, he stood for Winchester instead, together with the incumbents George Brydges and William Powlett, relatives of the Dukes of Chandos and Bolton respectively.
[2] He spoke in support of a petition to suppress hawkers and pedlars in 1748, his only recorded speech in Parliament.
In 1750, Lord Egmont thought, from Penton's confidences, that he might be discontented with the Ministry and prepared to join the opposition, but nothing came of it.