Sejo of Joseon
He was the son of King Sejong and brother of Munjong of Joseon and uncle of Danjong of Joseon , against whom he led a "coup d'état" to become king himself in 1455 . 
<triplet> Munjong of Joseon <subj> Danjong of Joseon <obj> child <triplet> Danjong of Joseon <subj> Munjong of Joseon <obj> father