His father was the Av Bais Din of Cracow, Rav Mordechai was the grandson of Rav Yehoshua of Cracow, mechaber of the Maginei Shlomo.
His son Rav Elyokim Getz, Dayan of Poznan, published his great-grandfather’s seforim, Maginei Shlomo and Shu”t Pnei Yehoshua.