Real Dictionary

brood
You can refer to someone's young children as their brood when you want to emphasize that there are a lot of them.
countable noun: A brood is a group of baby birds that were born at the same time to the same mother.
verb: If someone broods over something, they think about it a lot, seriously and often unhappily.

brood in American English
the offspring, or a family of offspring, of animals; esp., a group of birds or fowl hatched at one time and cared for together
intransitive verb: to sit upon eggs to be hatched, as a bird
noun: a number of young produced or hatched at one time; a family of offspring or young
transitive verb: to sit upon (eggs) to hatch, as a bird; incubate

brood in British English
noun: a number of young animals, esp birds, produced at one hatching
verb: to sit on or hatch (eggs)