Son of Esther and Haim Isser. Born in 1909 in the newly established Ahuzat Bayit neighborhood of Tel Aviv. Tzvi’s grandfather, Moshe Danenberg, who was one of the founders of Ahuzat Bayit, founded the first brick factory in Tel Aviv. On 28 Nisan (20.4.1936) he died and was brought to rest in the old cemetery in Tel Aviv, leaving a woman and a baby girl.