Bluma Eisenstadt

About 1st wife and 2nd wife:

According to Rabbi Avraham Benedikt ZT"L Rosh Yeshiva Chug Chasam Sofer Bnei Brak in his sefer Beer Hamoadim p.402:

He heard from Yitzchak Shiff from NY that he heard clearly from his grt grandfather Shmuel Zanvil Schiff (who was a expert in the genealogy) that R Binyamin did not have any children from his first wife so he married the 2nd time the daughter of the Yaavetz Reb Yakov Emdin.

Also that Yitzchak Shiff heard from Yehuda Hirschler who was a secretary and bookkeeper in Eisenstadt for 30 years that while there he searched the archives of Eisenstadt and Lackenbach and found there a letter that clearly titles R Binyamin among other titles "son-in-law" of the Gaon Yaakov of Altona.

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Also about Rabbi Yakov Amdin

Pls see the following of Sefer Lehoros Nusen from Rabbi Nusen Gestetner zt"l

https://hebrewbooks.org/pdfpager.aspx?req=928&st=&pgnum=15

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GEDCOM Note

While some claim she was the daughter of Rabbi Yaakov Emdin, others dispute that.

More on this topic in seforim: Meor haChaim, 1960 p.22, Shut Le'Horos Nasson V1 p.15