He is a great - grandfather of Sarah , Duchess of York through her mother Susan Barrantes , who is Powerscourt 's granddaughter .
Head entity: susan barrantes Q4165785 15 16
Tail entity: sarah, duchess of york Q55720 7 8 9 10 11
Relation (head \u2192 tail): P40
Inverse relation (tail \u2192 head): P25