PGK Art: McKean House was built in 1927 as private housing for Professor Horace McKean and his wife. Since 1981, the house had been occupied by several fraternity organizations. Union College is referred to as ‘the mother of fraternities’ because many fraternities, including the first three in America, as well as three other national fraternities, were founded there. More fraternities have been founded at Union than at any other college or university. The Union Triad is a name given to the first three Greek letter social fraternities with a continuing record founded in America. They were the Kappa Alpha Society (1825) (the oldest fraternity in the nation), Sigma Phi (1827) and Delta Phi (1827).