Eight-Nation Alliance attacked the capital, why didn't the Mongols come to help? Isn't it the Manchu and Mongolian families?

Because they have always had a good relationship before, they can be called a family. They are a family because of their good marriage relationship, but Beijing handles things rudely. Even if they attack the Mongolian army, they won't care, because on the surface they are a family, but when it comes to their own interests, they will only think for themselves and don't care about the Mongolian people's ideas at all.

Because of this incident, the Mongols came to propose marriage again, hoping that officials in Beijing would think about it for themselves. Because in ancient times, if relatives did not exist, it meant that there was no relationship between the two countries, so Mongolians would propose again for their own benefit, but Beijingers were still very decisive in handling things. When dealing with it, officials will be executed if they disagree and never pay attention to others.

At that time, Mongolians always chose marriage because the strength of Mongolians was not as great as that of the Qing Dynasty in Beijing, and the weakness of Mongolians was also caused by the Qing Dynasty, so they relied on marriage to maintain this intimate relationship. However, the Qing Dynasty put forward a plan that the Mongols were not allowed to unify the political power. At this time, a Genghis Khan suddenly appeared. He was very powerful, and then he said that all the princesses in the Qing Dynasty could not have influence in the Mongols.

Because the Qing dynasty had been bad to Mongolia before, even if there was a marriage, Mongolia would not be taken seriously. But when Genghis Khan appeared, it changed, Mongolia became stronger and unified Mongolia. At this time, Eight-Nation Alliance attacked the Qing Dynasty, but the Mongols did not support it, which led to the demise of the Qing Dynasty. Mongolia did not support them because the Qing dynasty never took them seriously, which led to such a situation.