Being the favorite child means you either:
a) Have an older sibling
b) Are more loved

c) Use the term to irritate your parents as they supposedly “love you equally”

The child in the family, often the second oldest, who is often the most unhappy in life. The "favorite child" will often put others down in attempts to make them feel better from the impending darkness inside that reminds them of how alone they are.

Being the least favorite child means you either:
a) Have a younger sibling
b) Are less loved
c) Use the term to irritate your parents as they supposedly "love you equally"