This variable contains the specific country of birth of each person's mother.
For the 2001, 2006 and 2011 censuses, data was only available for either Australian or Overseas. However, in 2016 the question expanded to collect the actual country of birth of a person's mother. The countries are coded to the same classification as the Country of Birth of Person, the Standard Australian Classification of Countries (SACC), 2016 (cat. no. 1269.0).
See also Country of Birth of Father (BPMP), Country of Birth of Parents (BPPP).
For categories see entry for - Country of Birth of Person (BPLP)