He was succeeded in the lordship by his daughter (see Lord Sempill for later history of this title) but the baronetcy had to pass to a male successor.
His youngest sibling, a trans man,[2] had changed legal gender from female to male by petitioning the Sheriff of Aberdeen in 1952, becoming Ewan Forbes-Sempill, and assumed the right of succession.
On his death in 1991 the title was then inherited by his cousin Sir John Alexander Cumnock Forbes, 12th Baronet, who had challenged the legality of the succession.
[3] However, the baronetcy is on the dormant list of the Standing Council of the Baronetage, as the 13th baronet has not yet established his claim to the title.
The heir presumptive is David Ian Ochoncar Forbes (born 1993), younger brother of the present holder.