Hello Geoff,
Brace yourself! I am fairly certain that I have found the family amongst the Litvak records.
The first census of the Russian Empire (28 Jan 1897) recorded this family in Komaiskaya Street.
KROK, Sholom Ber, Head of Household, 34 , , , Born and registered in Rokiskis. Joiner.In Kurland
KROK, Etel, Wife, 32 Born in Vilnius, registered in Rokiskis.
KROK, Chona Leiba, Son, 9 Born in Vilnius, registered in Rokiskis.
KROK, Stira Yudes, Daughter, 7 Born in Vilnius, registered in Rokiskis.
KROK, Libe Reishe, Daughter, 6 Born in Vilnius, registered in Rokiskis.
KROK, Baske, Daughter, 6 months Born in Vilnius, registered in Rokiskis.
The record also records that Etel was the daughter of an Itsek.
Sholom Ber is a Yiddish rendering of Shlomo Dov, Yudes is the Yiddish version if Yehudit and Baske (the Yiddish version of Bas Sheve) is commonly anglicised as Bessie.
Age and occupation match for Sholom Ber and, interestingly, he was actually in Kurland at the time of the census. There's the Dvinsk link. An earlier list of Box Taxpayers records him as a poor carpenter.
Krok was the Yiddish name for the shtetl of Kroki (קראָק) = Krakes in modern Lithuania.
A further record gives Stira Yudes Krok's b'day as 8 Nov 1889. ??
What do you think?
Justin