Watergate didn't appear in the early days, but through Jiraiya's hints and Kakashi's reflection on the four generations in Naruto, we infer that the four generations are Naruto's biological fathers. When Naruto was sealed by Payne and prepared to be completely swallowed up by Kyubi no Youko, four generations appeared in Naruto's consciousness and told Naruto how he died. At that time, four generations sealed bijuu, one in themselves and the other in Naruto's body, hoping that Naruto could control bijuu, enhance his strength and finally make a heroic sacrifice. After helping Naruto reset the seal, the four generations disappeared.
From here, we can see that Kyubi no Youko in Naruto is still full of hatred for four generations living under one roof. In the later period, Naruto and Kyubi no Youko reached a mutual understanding. Kyubi no Youko was moved by Naruto's spirit and was willing to help Naruto. Since then, Naruto has completed the perfect bijuu model, and his strength has greatly increased.
However, after four generations of reincarnation, the perfect bijuu model was used immediately, which was unreasonable, because Kyubi no Youko only agreed with Naruto and did not forgive the four generations. The reason for Bian Xiao's analysis is that when Kyubi no Youko was sealed, the four generations were divided into two parts. The four generations were Yang in Naruto's body and Yin in it, but they always belonged to chakra's body. After Yang knew Naruto, he also conveyed his consciousness to Yin. Here, we regard it as the same consciousness, similar to the shadow's ability. Because of this, Yin has also recognized Naruto and the four generations, and is willing to give strength to the four generations.
Another idea is that Yang Kyubi no Youko and Yin Kyubi no Youko are not the same consciousness at all, because when they meet, they greet each other and borrow chakras. Here we can analyze that they have their own consciousness after separation, so this leads to another problem. Yang can forgive, but four generations under one roof are not necessarily. Perhaps, when four generations under one roof were sealed, they sealed their souls together with Kyubi no Youko's in the body of a god of death. As we all know, the four generations and Naruto have the same personality, optimistic, positive and caring for others. In the long run, four generations will stay in the soul of Kyubi no Youko for a long time, and they will have corresponding dialogues. Maybe Yin will be moved by four generations living under one roof, so as to forgive four generations living under one roof, just like if you have a dog or cat, you will definitely have it at first sight.