Reply To: Does an invalid "get" cause mamzeirus? Home › Forums › Bais Medrash › Does an invalid "get" cause mamzeirus? › Reply To: Does an invalid "get" cause mamzeirus? December 16, 2013 2:08 pm at 2:08 pm #994117 popa_bar_abbaParticipant Well really having kids with someone else afterwards is the part that causes mamzeirus.