Copied from Drumry history website, templum.freeserve.co.uk/history/drumry.htm:
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The next laird, their son William, was to marry Christian of Callander and inherited the barony of Callander by his father-in-law's forfeiture in 1345.
Given Bruce's victory at Bannockburn in 1314, the Livingston family switched allegiance to Bruce. Indeed, William Livingston, grandson of Andrew who was a supporter of Edward Longshanks, became a comissioner to deal with the ransom of Bruce's son King David II in 1357.