The closest and most distant relationship is between husband and wife. No matter how much two people love each other, living under the same roof for decades will inevitably lead to some conflicts and frictions. What's not scary is the conflicts and frictions; what's scary is the inability to resolve them.
For example, despite the good relationship between my brother and sister-in-law, they still have cold wars over family trivialities.
Why did such a shrewd businessman like my brother give others opportunities to exploit? It's simply because he was in a cold war with his wife at the time, with his mind entirely on her, leading to a lack of vigilance externally.
"Ah! I remember now! The reason I was in a cold war with Mingli was that Feng Manman had come to me before and said many things to sow discord between us, so --" The sister-in-law remembered all the previously overlooked details during the cold war.
Everything clicked together completely.
