While the Xibe (锡伯族) are undeniably the closest relative to the Manchus (their language is merely a dialectal difference).. the next "closest" relative would be the Nanai.
It is important to note that these tribes are NOT nomadic and are mostly hunting and fishing peoples.
According to Tikhvinsky (Manzhou Rule in China, 1983, USSR Academy of Sciences), the Nanai are directly descended from the Woji tribes.
on page.84
"Tribes of another group, the Woji, settled west of the Wula, and east up to the Ussuri, with the Huifa and two Changboshan tribes (the Neyin and the Zhusheli) as their immediate neighbors in the south. In the south-east some of their lands extended to the basin of Suifenhe."
This clan, like many others in the region, are descendants of the Jurchen, but during the 1640's, were independent from Nurhaqi and Abahai. Some of the Woji joined the Niurhus of the Manchu banner forces, but in general, because of their distance and isolation, were largely left alone until the Russians came, as Nurhaqi and Abahai were busy focusing on the Solons and Huerha.
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From Owen Lattimore's "The Gold Tribe, "Fishskin Tatars" of the Lower Sungari" (gold/fishskin tatars are the old name for this group) published in "memoirs of the American Anthropological Association, 1933)
He emphasizes the physical differences between the Nanai and the "Chinese", noting that the Nanai generally had longer shaped faces and commonly had men over 5 feet 8. with high cheekbones, not higher than Mongols, but common with other people in Northern China. (p.353). In his opinion, he believes the Nanai closely resemble the purest "tungusic" type, whose features are still seen among the Manchus of Jilin.
In his book he states that because of the Manchu Banner Organization, many Nanai left their areas and quickly joined public service and other military/civil careers which eventually led towards their assimilation. Often, because they were tri-lingual in Manchu, Chinese and Russian, they held important border positions.
Relations with the Chinese, according to Lattimore, is generally good, although there were hostile feelings towards large migrations into their habitats. Nanai men were allowed to marry Chinese wives, but were not alowed to give their daughters in marriage to the Chinese. (p. 352-53)
Culturally it seems that they've adopted much less Chinese influence than their southern cousins that inhabit modern day Liaoning, although influences are still there such as the dress and some of the language which I will show examples in a bit.
Modern Day Nanai kids

Nanai robe, similar to the Manchu robes, yet lacks a "slash" or belt. Sometimes it is made out of fish skin

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Language comparison (from "The Minorities of Northeastern China: A Survey" by Henry G. Schwarz, 1984)
River
Bira - Manchu
Bira - Xibe
Bira - Nanai
Bira - Evenki
Mountain
alin - Manchu
elin - Xibe
urkan - Nanai
ura- Evenki
Iron
sele - Manchu
sal - Xibe
sala - Nanai
sala - Evenki
-- other vocabulary-- (from Studies in Frontier History, p.396) perhaps someone with better Manchu knowledge can make a more detailed comparison between the two languages..
(moved below)
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currently about 12,000 Nanai live in Russia, and about 2500 are in China.
--more pics--

older picture

will post more later, particularly pics of their weapons.











