Nguyễn Phúc Hồng Cai
Tự Đức had no child , and adopted Hồng Cai's two sons , Ưng Đăng and Ưng Thị , who later became Emperor Kiến Phúc and Emperor Đồng Khánh respectively . 
<triplet> Tự Đức <subj> Kiến Phúc <obj> relative <subj> Đồng Khánh <obj> relative <triplet> Kiến Phúc <subj> Tự Đức <obj> relative <subj> Đồng Khánh <obj> sibling <triplet> Đồng Khánh <subj> Tự Đức <obj> relative <subj> Kiến Phúc <obj> sibling