His only daughter's great-grandson, Charles Rawdon-Hastings, 11th Earl of Loudoun succeeded in 1874 and held the lands of Rowallan as Laird.
The person who inherited the title was his only daughter's great-grandson, Charles Rawdon-Hastings, who took over as the 11th Earl of Loudoun in 1874 and oversaw the management of the Rowallan estate.