Answer: firstborn

AnswerCrossword Clue
FIRSTBORNBart, among the Simpson kids
FIRSTBORNEldest
FIRSTBORNEldest.
FIRSTBORNCause for joy
FIRSTBORNLike Cain
FIRSTBORNHeir to a throne, typically
firstbornthe first in order of birth, the eldest child
firstborn(of a person's child) The first to be born; the eldest