Saul Feldman entered Yakov-Itzhak's Date of Birth as January 25, 1910, which is what it currently is.
1910 is long after the currently listed date of death of his father, and before the currently listed dates of birth of some of his children.
The Encyclopedia of Jewish Women in the article on Zivia Lubetkin says "Zivia Lubetkin was born on November 9, 1914 to a well-to-do, traditional Jewish family in the town of Beten in eastern Poland, where in 1880 her father, Ya’akov-Yizhak, who ran a small business, had also been born."
--Omitting the extraneous material - it says Ya’akov-Yizhak was born in 1880 in Beten.
https://jwa.org/encyclopedia/article/lubetkin-zivia
I am thinking Date of Birth should be changed to 1880 or circa 1880.
And should place of Birth be adjusted also?