(1) adau mata: the first mother, to whom we are born.
(2) guru-patni: the wife of the spiritual master.
(3) brahmani: the wife of a brahmana.
(4) raja-patnika: the wife of the king.
(5) dhenu: the cow, she gives us milk.
(6) dhatri: the nurse.
(7) prthvi: the earth.Source
http://vaniquotes.org/wiki/Seven_kinds_of_mothers
