The singular is child and the possessive plural is children's
The conflict between Laocoon and the Trojans was that when
the Trojans saw the Greek ships leaving, they thought the war was over. When they saw the wooden horse, they thought
it was a gift and wanted to bring it inside Troy. Laocoon objected thinking it was a trick but
the Trojans disregarded his warning.
Laocoon insisted but Athena had two serpents from the sea attack him and
this enabled the Greeks to sneak in and conquer Troy.
Who is speaking voice they related
She is referring to her brother, Polynices, who was killed in the battle known as the Seven Against Thebes. King Creon (or Creonte), who is also Antigone's uncle, is actively preventing her from seeing her brother and ensuring a proper burial.