paragraph: Cavour was a younger son of a noble Piedmontese family, and entered the army in 1826, serving in the engineers. His liberal sentiments made him distrusted by the government of Charles Felix as a dangerous man, and he was doomed to an inactive life in an unimportant post. He soon quitted the army, and embarked in business operations as manager of one of the estates of his family. For twelve years he confined himself to agricultural labors, making himself acquainted with all the details of business and with the science of agriculture, introducing such improvements as the use of guano, and promoting agricultural associations; but he was not indifferent at the same time to public affairs, being one of the most zealous advocates of constitutional liberty. A residence in England gave him much valuable knowledge as to the working of representative institutions. He established in 1847 a political newspaper, and went into parliament as a member of the Chamber of Deputies. In 1848 he used all his influence to induce the government to make war with Austria; and when Charles Albert abdicated, and Victor Emmanuel became king, Cavour's great talents were rewarded. In 1850 he became minister of commerce; in 1852, prime minister. After that, his history is the history of Italy itself. 
question: Cavour worked in agriculture after doing what for his family?
answer: He became the head of his family