Reference: Davidson, John, Rev., Inverurie and the Earldom of the Garioch; A. Brown & Co., Aberdeen 1878.
Page 210: 1622, 8 January. - Christian Forbes, Lady Caskieben, departit this life, of age three score and sixteen years.
Page 224: John Johnston's "godlie verteous" life has been noticed, and his death at Ardiharrall, 4th February, 1613-14. His mother, the old lady of Caskieben, Christian Forbes - who saw her husband, her oldest son, and both his wives, all laid in the grave - lived herself until 1622, attaining the age of seventy-six, notwithstanding the burdens of maternity recorded of her in the family history, that she "buir ane fair bearntyne" to her husband. The provision required for the six sons and seven daughters, who of her children attained maturity, dilapidated the once extensive estate, and along with further alienations required for John Johnston's family, prepared the way for his son, the first baronet, being likewise the last proprietor of Caskieben.
Page 449: George Johnston of that Ilk and Caskieben succeeded
his grandfather in 1548, and died in 1593 (p. 164). He married Christian Forbes,
daughter of William, 7th Lord Forbes, who survived him until 1622. They had six
sons and seven daughters.