Yichus is like potatoes the best ones are in the ground

aaron zalman sharpe, comment No. 103 to the Chasid Bobuv B'nusach Chabad post:

By the way I met Rabbi Halperin and the information he puts into Sefer Tzezoim is based on what information he received from einykel. There are gaps as because if someone married out their partner and children�s names are not mentioned. E.g daughter in law and grandchildren of Yehudi Menuhin are Chinese.

There are mistakes in the Sefer but there is also a mistake I believe in a genealogical reference book called "The Unbroken Chain" by Rosenstein that states that Pinchas Reizes married the daughter of the Alter Rebbe.

It is a family tradition that the name Reizes was the name of a woman who had 3 daughters. One married Pinchas Reizes, another married Binyomin Kletzker and a third married Moshe Shlomo Zalman who took on the name Reizes. His son Yaacov Culi Slonim married my alter Bobbe Menucha Rochel Schneuri . The biography of Pinchas Reizes by SDB Avtzon claims the Friediger Rebbe stated that Moshe Shlomo Zalman Reizes married one of his wife's sisters. This statement is difficult to understand. We do know that Moshe Shlomo Zalman Reizes did marry a second time in his old age to his brother's daughter and settled in Eretz Yisroel. This is stated in the Pinchas Records of Rubinowicz and I saw this also written in Daat Kedoshim which traces the Slonim family back to the Rema and the Zichron Moshe who claimed descent from the Ri. The point is Seforim, do have errors and often we rely on oral traditions handed down through families.There is the risk that they do change over time. Remember yichus is like potatoes the best ones are in the ground.