Inheritance
Lady Mary’s father the 12th Duke of Hamilton died in 1895. The late Duke’s estates were valued at £1,902,559 for probate, although these were encumbered with £965,999 in debts. The bulk of his Scottish estate was left to the next-in-line to the Dukedom, Lady Mary’s fourth-cousin-once-removed Alfred Douglas-Hamilton, 13th Duke of Hamilton; however, under the terms of her father’s will Lady Mary inherited:
The 4,900-acre Easton Park estate in Suffolk and 102,000-acre Isle of Arran estates (centred on Brodick Castle) in Scotland; the combined valuation of these estates was deemed to be £374,713 for probate purposes in 1895;
A £100,000 Trust Fund; and,
An additional annuity for life of £7,000.
Consequently, Lady Mary became a wealthy heiress; during her early adulthood she reportedly enjoyed an annual income of over £30,000.
Lady Mary's inheritance was subject to some £36,000 in death and settlement duties, which she was eventually required to pay after her father's successor Alfred Douglas-Hamilton, 13th Duke of Hamilton instigated legal proceedings against Mary and her father's executors in 1916, during which he claimed that he did not bear responsibility for the payment of death duties on property inherited by Lady Mary.