The term 'favorite one' can be broken down into three separate crossword solutions: IDOL (4 letters), PET (3 letters), and SON (3 letters). An IDOL is someone who is admired and respected, often a celebrity or public figure. A PET is an animal kept as a companion, usually a domesticated animal such as a dog or cat. A SON is a male child, typically the offspring of a father and mother. All three of these terms can refer to someone's favorite one, whether it be an IDOL they admire, a PET they love, or a SON they are proud of.