the eldest of sisters and brothers—a head of a gang or a bandit chieftain
老大
old;eldest child;number one in order of seniority 少小離家～回，鄉(xiāng)音無改鬢毛衰。(賀知章《回鄉(xiāng)偶書兩首》)I left home young.I return old,speaking as then,but with hair grown thin.(Impromptu Lines Composed upon Returning to My Native Place by He Zhizhang.)