This is the most likely birth record for Margaret -
Margaret Thompson
q4 1873, Auckland
Vol 10a Page 248
Mother's maiden name - Clarkson
Siblings of Margaret as per 1881 -
Births -
Mary Hannah Thompson
q4 1871, Auckland
Vol 10a Page 237
MMN - Clarkson
Jane Ann Thompson
q2 1868, Aucklans
Vol 10a Page 180
MMN - Clarkson
Sarah Thompson
q1 1870, Auckland
Vol 10a Page 214
MMN - Clarkson
Robert Thompson
q2 1866, Auckland
Vol 10a Page 215
MMN - Clarkson
JJ