Mom and Aunt Xiaoying had a tight bond since childhood, but even knowing the other was in the wrong, she would still insist on helping, which had nothing to do with their close relationship.
Mom was a full ten years older than Aunt Xiaoying; as the saying goes, "an elder sister is like a mother." When they were little, Aunt Xiaoying was practically raised by Mom, so their sisterly affection was even stronger than their bond with their parents.
In the first few years of Aunt Xiaoying's marriage, the sisters' relationship remained as innocent as ever, but ever since her father-in-law's rise in the political world, overtaking and surpassing Father Qiao Shanren, the sisters' bond had turned sour.