The term 'Brother Jacob' can refer to several different people. The crossword solutions for this term are Esau (4 letters), Riis (4 letters), ASTOR (5 letters), and Levi (4 letters). Esau was the twin brother of Jacob in the Bible, and is known for selling his birthright to Jacob. Jacob Riis was a Danish-American social reformer and journalist who wrote about the plight of the poor in New York City. John Jacob ASTOR was a German-American businessman and investor who founded the ASTOR family dynasty. Lastly, Levi was another brother of Jacob in the Bible, and is known for being the founder of the Israelite priesthood.