baby of the family vs bub

baby of the family

noun
  • 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. 

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

bub

noun
  • A young brother; a little boy; a familiar term of address for a small boy. 

  • A term of familiar address; bubba; bubby. 

  • A woman's breast. 

  • A baby. 

  • An alcoholic malt liquor, especially beer. 

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