Duan Po's younger sister was named Duan Ning.
Judging from the aura she revealed, she was a Level-4 Heavenly Immortal powerhouse.
Duan Po had previously mentioned to Saine that his sister suffered from a "strange disease" that kept her from growing up, no matter what.
She truly had not grown up.
Other than children, it was difficult to find another female creature in the Star Realm who looked even smaller than Tourmaline.
Yet unlike Tourmaline's adorably dazed disposition, Duan Ning, who clearly had the body of a little girl, carried herself with striking maturity and calm.
When she first met Saine and the other Wizard Civilization powerhouses, Duan Ning neither groveled nor acted arrogantly as she clasped her hands and bowed to them.
Only when Nasi Xiu, seeing this female cultivator who was far smaller than himself, reluctantly called her "Aunt"—
did Duan Ning's mature bearing finally shatter.
Her little face flushed bright red all at once.
Before coming to the Wizard Civilization Battlefield, she had likely never imagined that a great nephew would suddenly appear out of nowhere.
"I became sworn brothers with Duan Po, and Nasi Xiu is Duan Po's adopted son. From now on, you are my little sister as well."
"I heard Duan Po mention your strange disease before. Once the war in the Proxi Star Region eases up a little, I'll make time to take a look at it for you," Saine told Duan Ning.
Saine was older than Duan Po, had now attained a Level-6 body, and had even saved Duan Po back then.
Thus, Saine should rightfully be the eldest brother.
Since Duan Ning was Duan Po's younger sister, she was naturally Saine's younger sister as well.
Whether by sentiment or reason, Saine ought to help Duan Ning resolve the strange disease within