Nguyễn Phúc Hồng Y
Nguyễn Phúc Hồng Y (阮福洪依, 11 September 1833 – 23 February 1877) courtesy name
Quân Bác (君博), was a prince of Nguyễn dynasty, Vietnam.
He was father of Dục Đức.
Hồng Y was the fourth son of Thiệu Trị, and his mother was Nguyễn Thị Xuyên.
He was granted the title Kiến Thụy Công (建瑞公, "Duke of Kiến Thụy") in 1846.
He was wide range of learning and had talents in literature.
He often exchanged poems with Emperor Tự Đức, Prince Miên Thẩm and Prince Miên Trinh.
Tự Đức had no child, and adopted his second son Ưng Ái, whom later became the Emperor Dục Đức.
Hồng Y died in 1877.
He was granted the title Kiến Thụy
Quận Vương (建瑞郡王, "Provincial Prince Kiến Thụy") and received the posthumous name Tuệ Đạt (慧達).
In 1889, his grandson Thành Thái ascended the throne, and granted him the title Thụy Thái Vương (瑞太王, "King Father Thụy"), and changed his posthumous name to Đôn Chính (敦正).
Nguyễn Phúc Miên Trinh
Nguyễn Phúc Miên Trinh( 3 February 1820 – 18 November 1897), born Nguyễn Phúc Thư( 阮福書), was a prince of Nguyễn dynasty, Vietnam.
Nguyễn Phúc Miên Bửu
Nguyễn Phúc Miên Bửu( 30 May 1820 – 8 March 1854) was a prince of Nguyễn dynasty, Vietnam.
He was the twelfth son of Minh Mạng, and his mother was Hồ Thị Tùy.
In 1843, he was granted the title Tương An Công( 襄安公," Duke of Tương An") by Emperor Thiệu Trị, and became the teacher of two princes, Nguyễn Phúc Hồng Bảo and Nguyễn Phúc Hồng Nhậm( later Emperor Tự Đức).
Hồng Bảo disliked studying, so Thiệu Trị did not like him, and lost his succession of the throne.
Thiệu Trị died in 1847, and appointed Hồng Bảo's younger brother Hồng Nhậm as successor.
In 1854, Hồng Bảo plotted a rebellion against Tự Đức and was forced to commit suicide.
Miên Bửu was suspected of taking in this plot, but there was no evidence.
Feeling sad for the fate of Hồng Bảo, he died in the same year.
Finally,
Tự Đức decided to pardon him, and granted him the title Tương An Quận Vương( 襄安郡王," Provincial Prince of Tương An") in 1878 posthumously.
Miên Bửu was good at writing Vietnamese poetry.
He and Nguyễn Phúc Miên Thẩm( Prince of Tùng Thiện), Nguyễn Phúc Miên Trinh( Prince of Tuy Lý), were known as" Tam Đường"( 三堂) of Nguyễn dynasty.
He was a member of" Mạc Vân thi x ã Mạc Vân Poetry Society").
Nguyễn Phúc Miên Định( Prince of Thọ Xuân), Nguyễn Phúc Miên
Thủ( Prince of Hàm Thuận), Nguyễn Phúc Miên Thẩm( Prince of Tùng Thiện), Nguyễn Phúc Miên Trinh( Prince of Tuy Lý), Nguyễn Phúc Miên Triện( Prince of Hoằng Hóa), Nguyễn Văn Siêu, Cao Bá Quát, Hà Tôn Quyền, Phan Thanh Giản and Nguyễn Đăng Giai were also members of this poetry society.
Thừa Thiên (empress)
Empress Thừa Thiên( 1762–1814), born Tống Phúc Thị Lan( 宋福氏蘭), was the first wife of Nguyễn Phúc Ánh( future Emperor Gia Long) and mother of Crown Prince Nguyễn Phúc Cảnh.
She was a daughter of general Tống Phước Khuông of Nguyễn lords.
Nguyễn
Ánh married her when he was at the age of 18.
Empress Thừa Thiên had two sons with Gia Long: Nguyen Phuc Chieu( who died after several days) and Crown Prince Nguyễn Phúc Cảnh.
After her death, she was buried at Gia Long's Thiên Thọ tomb, alongside the Emperor.
Tự Đức
Tự Đức( lit." inheritance of virtues", 22 September 1829 – 17 July 1883)( personal name: Nguyễn Phúc Hồng Nhậm, also Nguyễn Phúc Thì) was the fourth emperor of the Nguyễn dynasty of Vietnam; he ruled from 1847 to 1883.
Nguyễn Phúc Hồng Bảo
Nguyễn Phúc Hồng Bảo( 19 April 1825 – January 1854) was a prince of the Nguyễn dynasty, Vietnam.
Thiệu Trị
Thiệu Trị (lit. "inheritance of prosperity"; 6 June 1807 – 4 November 1847), personal name Nguyễn Phúc Miên Tông or Nguyễn Phúc Tuyền, was the third emperor of the Nguyễn Dynasty.
He was the eldest son of Emperor Minh Mạng, and reigned from 14 February 1841 until his death on 4 November 1847.
Đào Duy Từ
Đào Duy Từ( 1572 – 1634) was a Vietnamese scholar, poet, military adviser, and mandarin who served under the reign of Nguyễn lord Nguyễn Phúc Nguyên.
Nguyễn Phúc Luân
Nguyễn Phúc Luân or Nguyễn Phúc Côn( 阮福㫻, 1733 – 1765) was a son of lord Nguyễn Phúc Khoát and father of Nguyễn Phúc Ánh( future emperor Gia Long of Vietnam).
Nguyễn Phúc Miên Định
Nguyễn Phúc Miên Định( 阮福綿定, 5 August 1810 – 5 November 1886), born Nguyễn Phúc Yến( 阮福宴), was a prince of Nguyễn dynasty, Vietnam.

Question: Who is Nguyễn Phúc Hồng Y's paternal grandfather?