Charnock was the godson of Richard Fleetwood of Penwortham, uncle of Sir Richard, Baron of Newton.
Charnock became deeply indebted in the early 1620s as a result of having stood as surety for Tyldesley, a fellow Gray’s Inn lawyer. The expenses of serving as reader at Barnard’s Inn may also have contributed to Charnock’s financial difficulties.
Charnock’s will, dated 23 Sept. 1643, was proved in March 1645.
