Maybe somebody can help me pursue this problem. I found the Volozhin
Yizkor Book and it has a lot of information about my ancestors Rabbi
Chaim Volozhin and his son Itzele (1780-1849). It gives the names of
four of Itzele's children, Eliyohu Zalmen, Rivke, Reyne-Basye, and
Rekhl. But it also mentions two others without giving their names.
How can I find out what their names were. I don't think that this is
impossible because according to historian Michael Stanislawski,
Itzele was probably the best known Russian Jew in his generation.
Researching the Yisroylim branch of the SOLOVEICHIK family