George McCorquodale (1817 - 1895)
Alexander Cowan McCorquodale (son of George)
Alexander George McCorquodale (son of Alexander Cowan and 1st husband of Barbara Cartland)
Raine McCorquodale (daughter of Alexander George)

George McCorquodale (1817 - 1895)
Harold McCorquodale (son of George and brother of Alexander Cowan)
Kenneth McCorquodale (son of Harold)
Alastair McCorquodale (son of Kenneth)
Neil McCorquodale (son of Alistair, grandson of Kenneth, husband of Sarah Spencer)

George McCorquodale (1817 - 1895)
Harold McCorquodale (son of George and brother of Alexander Cowan)
Hugh McCorquodale (son of Harold, brother of Kenneth and 2nd husband of Barbara Cartland)
Ian McCorquodale (son of Hugh and half-brother of Raine)

Barbara's 1st and 2nd husbands were 1st cousins.