in 1954 horowitz married miriam adler, daughter of rebbe elazar adler of the zvhil dynasty, who gave birth to their son yaakov yitzchak "yankel" in 1956. he was raised in his maternal grandparent’s home in the west hollywood section of los angeles, and now serves as rabbi of the bostoner shul in lawrence, new york. horowitz married the daughter of yonah hass in his second marriage. they have one son, yisrael yona, and seven daughters.