Who was Yitzhak Yosef Seibel's father (our "missing link")?
We believe that Yitzhak Yosef Seibel's father was actually Yecheskal Seibel, the father of Moshe Tzvi, thus making Yitzhak Yosef and Moshe Tzvi brothers. As of now, we have no documentation to prove this. However, his son, Hersch Melech (Herman) Seibel, married a very close cousin, Moshe Tzvi's granddaughter, Lena Seibel (a "German cousin" according to her nephew, Bernardo Seibel). If Yecheskal was actually Yitzhak Yosef's father, then Herman and Lena would have been first cousins once removed. If instead his father was a brother of Yecheskal, then they would have been second cousins once removed, not "very close."
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