When M‘Neile was 20, his father's unmarried brother, Lieutenant-General Daniel M’Neile (1754–1826), returned to Ireland following distinguished service with the East India Company. His uncle, who settled in Bath, delighted in M’Neile's company, and his uncle virtually adopted him; and, it seemed, he was the heir presumptive to his uncle's considerable fortune. His uncle, whose wealth and influence would have easily have procured M‘Neile a seat in parliament, and who understood that success at the bar would be a stepping-stone for the talented lad into a productive political career, encouraged him to pursue a legal career. He took his A.B. in 1815, and continued his legal studies.