OUR father!

Explanation From Original OP:

During the war of Chu–Han Contention (楚漢相爭, basically the showdown for who can own China after the Qin Dynasty collapse), Liu Bang (劉邦) the King of Han (later became the first emperor of Han Dynasty)was surrounded and besieged by Xiang Yu（項羽）the ruler of Chu. Knowing he needed a fast victory due to Han armies were harassing his supply line, Xiang Yu captured Liu Bang’s father and threaten him to come out and fight his army (which he would definitely win, Xiang Yu basically never lost a single battle under his command despite eventually lost the war) or else he would cook Liu Bang’s father in front of everyone. Which Liu Bang answered:

“Xiang Yu, we vowed to ‘be each others’ brother’ when we were serving King Huai II of Chu (楚懷王, the figurehead leader for Anti Qin Alliance when the rebellion broke out, Xiang Yu later killed him), which means my father is your father, so if you want to cook your father, please do save a bowl of soup for me.”

(「吾與項羽俱北面受命懷王，曰『約為兄弟』，吾翁即若翁，必欲烹而翁，則幸分我一桮羹。」)

Xiang Yu was so enraged by this he almost killed Liu Bang’s father right there, but his uncle stopped him for not wanting to hurt their reputation. The siege was eventually lifted due to supply issues.

p.s. Legend says Xiang Yu had double irises. Hence why the design.