baby of the family vs overparent

baby of the family

noun
  • An adult member of an immediate family who is treated by others in the family, especially the parents, as though they were a child. 

  • The youngest member of an immediate family. 

  • A member of an immediate family who behaves as, or is treated as though they were the youngest member of a family. 

overparent

noun
  • A person or entity in a position of greater authority than a parent who takes on some aspect of the parental role or authority. 

  • The role of the state in caring for and nurturing its citizens. 

verb
  • To provide an excessive amount of parental attention and protection to one's children. 

How often have the words baby of the family and overparent occurred in a corpus of books? (source: Google Ngram Viewer )