 George Munro, 1st of Culcairn was the second son of Sir Robert Munro, 5th Baronet (of Foulis-Obsdale and chief of the Clan Munro) and his wife Jean, daughter of John Forbes, 2nd of Culloden.According to the 19th-century historian Alexander Mackenzie, when Sir Hugh Munro, 8th Baronet of Foulis-Obsdale died in May 1848, followed by the death of his daughter eight months later, had there been a male representative of the Munro of Culcairn family then it would have been the Munros of Culcairn who would have succeeded to the Baronetcy of Foulis-Obsdale and chiefship of the Clan Munro.However, according to Mackenzie the Munro of Culcairn family had terminated in a female representative and so succession to the Baronetcy devolved upon the Munro of Culrain family, with Charles Munro, 7th of Culrain succeeding as the 9th Baronet of Fouis-Obsdale.