But back to Einseidler. What is new and different that we learn from the papers? Most of the new information relates to two brothers of Isaac Elchanan. We know from Shimoff that Isaac had two older and one younger brothers. Of second brother Abraham Aaron, Shimoff writes that he was accomplished in the rabbinate, but he died young before having children. Shimoff tells us Spektor was deeply affected by his brother's death.
According to Einseidler's reading of the literature, the eldest Spektor brother, Moshe Joseph, then married Abraham's widow, in observation of the law of chalitza, in which an unmarried brother of a deceased married brother is obligated to marry the widow (unless he is released from the obligation in a ceremony involving the taking off of the brother's shoe).
In this case, Moshe kept his shoe and married the unnamed widow and they later had a daughter Shifra. From here, things get a bit surprising as Shifra marries a man named Aryeh Spector. This could be an example of a husband assuming the wife's name, if she had an honored name they wanted to carry on, or it could be coincidences of two unrelated Spektors finding each other, or it could be some kind of intermarriage.
In any case, Shifra and Aryeh have at least two children, Chaim Shmuel and Meir (born in 1884). Meir goes to Palestine in 1910, marries Esther and has three children, Jacob, Emanuel and Rachel. Rachel later marries David Belkin.
His older brother, Chaim Shmuel, also appears to marry another Spektor, Frieda daughter of Shlomo. The same possibilities apply here as above, though in this case Einseidler indicates that Chaim and Frieda are indeed cousins.
These possible Spektor-Specktor marriages would be one way for the family to expand to support claims of other Spektors to a relationship with the rabbi. We'll have to look more closely at the origins of Aryeh Spektor and Frieda Spektor to determine what other Spektors can claim a relation by marriage to the family of Isaac Elchanan's older brother.
Whatever turns out there, we know from the Pioneers book that Chaim and Frieda have another son Aryeh in 1909 in Halle, Germany, his grandfather having evidently previously passed away. Aryeh also goes to Palestine in 1933, and has two children Chaim Samuel (named for his predeceased father) and Simcha.
If all that is right, then we have five descendants of Moshe Joseph Spektor living in Palestine in the pre-war years. If we are next able to track Jacob, Emanuel, Rachel, Chaim Samuel and Simcha Spektor, we will be closer to identifying living descendants from that line.
Okay, on to part 3 for the information on brother Jacob David Spektor.