According to the epitaph of Nalan Xingde's father Mingzhu, "Nalan became rich and died young; Fulton, a scholar in the thirty-ninth year of Kangxi; The second blessing is all virtue. There are four granddaughters: Gao Qizhuo, a lecturer in imperial academy for a long time, Nian Gengyao, a lecturer in imperial academy for the second time, and Makana for the second time. They all die first, and they are all virtues. "
Aside from the third son, that is to say, when Mingzhu died, his son Nalanxingde had decided to have four daughters. The eldest daughter married Gao Qizhuo, the second daughter married Nian Gengyao, and the third daughter married Ma, all of whom died young. The only daughter who can marry the emperor doesn't even have a name, and the whole history book doesn't describe her fate, so it is impossible to make a judgment.
But personally, it is unlikely that the fourth daughter will marry the emperor. Nalan Xingde died in 1685, in the 24th year of Kangxi. According to the description of his children in the epitaphs written by three people before and after Nalan Xingde (Xu, Jiang, and, in turn), it can be found that Nalan Xingde has a posthumous child or more than one child that was not recorded at the time of writing:
Xu's version is: "Two men, Fuge, Yongshou, a posthumous child and a woman, all young."
Jiang's version is: "Marry the Lu family, follow the official family, and the foreign descent is detailed in Ge Xue's epitaph and the description of Gu Sheren Huafeng." Assistant room surname, two children and one daughter. Judging from the "detailed record", Jiang learned from Xu Gan's research and the materials of "Gu Sheren", and at the same time brought out Nalan's deputy room, leaving out the unborn posthumous child.
Han's version is: "Marry Lu and give it to Shu people. Daughter of Lu Xingzu, Governor of Guangdong and Guangxi. Following the official, the daughter of an official. Two sons and two daughters. This is Han's record, which means that when Han wrote the epitaph, the posthumous child was born, a daughter.
According to these epitaphs, it can be considered that the two extra daughters on the Pearl tombstone were probably born in a different room or even adopted, so Nalanxingde was not recorded when he died. At the same time, according to common sense, Nalan Xingde's posthumous child is the fourth daughter without any record, because there is no younger sister. Conclusion: Miss Si, who may marry the emperor, was born in 1685, in the 24th year of Kangxi.
Then the next question is simple. Kangxi reigned for 6 1 year. If this young lady wants to marry the emperor, she must either marry Kangxi or marry Yongzheng when Yongzheng is not in office, at least 16 years, that is, 40 years after Kangxi. Among Kangxi's concubines, there is a four-person named "Nora/Nalan/Nora", which is not worthy at any time. The number of wives and concubines in Yongzheng's hiding place is limited, and all of them have clear family records. None of them can be suspected to belong to Huei-fang. Huei-fang can't marry into the palace unless she adopts and changes her surname, and at the same time catches up with Grandpa Kangxi/Uncle Yongzheng (Nalan Xingde's aunt is Hui Fei of Kangxi and eldest brother Yin Ge's biological mother, so from this perspective, Kangxi and Mingzhu are the same generation).
So the conclusion is: it is basically impossible for Nalan Xingde's daughter to marry the emperor, and the rumors are not credible.