Polyneices was considered a traitor by King Creon for attacking the city of Thebes. Polyneices body was not permitted to be buried, but left for the scavenger birds and dogs to eat. Eteocles was to receive a hero's burial.
An adjective clause functions as an adjective, that is, it gives some information about a noun in a sentence (or a pronoun) ( information which is not an action).
The noun modified here is "knife" and the information about the knife, that is the complete adjective clause is "<span> that his dad gave him.
"</span>
Sorry buddy, idk. Probably they became friends
