pro-parent
/ˈprəʊˌpɛːrənt/ /ˈprəʊˌpɛːr(ə)nt/noun
A person who takes the place of a parent; a guardian; (also occasionally) †a progenitor, an ancestor (obsolete ).
Origin
Mid 17th century; earliest use found in Daniel Cawdrey (d. 1664), Church of England clergyman and ejected minister. From pro- + parent.