Mary was the sole executrix to whom Administration was granted.
In 1786 Maxwell was named executrix to Lady Glenorchy and was given a particular responsibility for maintaining Glenorchy's chapels and other institutions.
At his death it was found that he had left his mistress, with whom he had lived for four years, his sole executrix and legatee, and Greville notes in his Memoirs the anxiety of Brougham and others to get the papers into their hands and suppress them.
Sir George Carteret had bequeathed his province to eight trustees, who were to administer it for the benefit of his creditors, and for the next two years the government was conducted in the name of his widow and executrix, Lady Elizabeth.