He had a daughter , Janet , who married Sir Robert Anstruther , 3rd Baronet of Balcaskie .
Sir Alexander Erskine was the 5th Earl of Kellie .
Alexander Erskine had a daughter , Janet , who married Sir Robert Anstruther , 3rd Baronet of Balcaskie .
Sir Alexander Erskine was the 5th Earl of Kellie .