Nguyễn Phúc Hồng Cai
He was the father of three emperors: Kiến Phúc , Đồng Khánh and Hàm Nghi . 
<triplet> Kiến Phúc <subj> Đồng Khánh <obj> sibling <subj> Hàm Nghi <obj> sibling <triplet> Đồng Khánh <subj> Kiến Phúc <obj> sibling <subj> Hàm Nghi <obj> sibling <triplet> Hàm Nghi <subj> Kiến Phúc <obj> sibling <subj> Đồng Khánh <obj> sibling