co-parent vs pater

co-parent

noun
  • Someone who shares in the parenting of a child or children, such as 

  • A godparent. 

  • A divorced or separated parent who shares custody with the other parent. 

  • A parent in a same-sex couple. 

verb
  • To act as a co-parent; to share custody of a child or children; to share in the responsibility of parenting a child or children. 

pater

noun
  • Father. 

How often have the words co-parent and pater occurred in a corpus of books? (source: Google Ngram Viewer )