[ptaipale]

Couldn't a Soviet international passport contain the names of parents as well? I am sure the domestic passport had that information.

For everyone in Soviet Union near the major population centers, a domestic passport was necessary. And for instance any "enemy of the people" (as defined by section §58 of Soviet penal code) status was recorded in not only the passport of the said enemy, but also his/her children's passports.

https://en.wikipedia.org/wiki/Passport_system_in_the_Soviet_...

[TazeTSchnitzel]

Perhaps in her case the information was missing.