 They remained as trustees administering his estate after his death in the following year on 26 April 1917.Under the terms of Cameron's will, his wife continued to reside at Lochiel (including the enjoyment of the museum) until her death in August 1945 when Lochiel passed to their two sons.The Brisbane City Council Sewerage Detail Plan records that by 1927 an upper story had been added to Lochiel positioned over the early brick eastern wing, although based on photographic evidence this may have been as early as 1912.