Jurchen language is written in Chinese characters, and the language families of both languages are Altai. Jurchen language is a language that was later revived. Like Xixia, it is A Qiang. It has been extinct for a while, and no one uses it. Later, some scholars helped them to restore the language and let the local people speak it in their current spoken language, which gave them a good result.
Jurchen script
Nüzhen
Just like the western languages Hebrew and Latin, their writing (Hebrew) was dormant (extinct) for many years, but Latin was not Latin, and the language disappeared, but it was revived later.