It’s puzzling not to be able to place Fanny Pettingal in this family.
Charles Richard Pettingal benefited from the will (proved in 1838) of his uncle George Hanbury Pettingal. Another legatee was “God-daughter” Julia Maria Pettingal, daughter of Chas Pettingal, foreign officer (his will, proved in January 1847, is also online - both he and Julia died in the Cape Verde Islands in late 1846).