William King and Margaret Fitzgerald

hi looking for decendants of William King and Margaret fitgerald, my great great gandmother was their daughter Ellen Catherine King, Ellen had a brother named William Samuel King JR. Would love to here from you.
Margaret and William were married in sydney in 1854, there children were, Alfred Ernest B 1868 d 1936 and Elizabeth (Holgate)nee King B 1872 and D 1959