Molyneux inherited not only his father’s vast landed estates but also many of his numerous local offices. Although contracted at an early age to marry his father’s ward, Fleetwood Barton, he refused to honour the arrangement, which was broken off in 1608.
Though aged barely 20, Molyneux was returned for Wigan in 1614, presumably through his father’s local influence and longstanding connections with the Gerards of Ince. He made no recorded impact on the brief Addled Parliament. Back in Lancashire, he gradually began to assume some of his father’s duties, for example swearing in Edward Moore* as sheriff at Liverpool in 1620, and in 1623 he succeeded to his family’s estates.
Unlike his father, who had been a diligent magistrate, Molyneux took little interest in county affairs, the only exception being his enthusiasm for military pursuits.
Notwithstanding the great wealth that he had inherited, Molyneux amassed extravagant debts; he presumably paid at least a few thousand pounds for his peerage, and by the late 1620s was borrowing heavily.
Molyneux died on 8 May 1636 and was buried the next day in the family vault at Sefton, having made last minute provisions for the special livery of his sons, the eldest of whom, Richard, was aged seventeen.
