They are from families who have a bad history with echother
Samson = Subject (reason why: Samson is doing the giving)
Gave = Verb (reason why: Samson "gave")
Philistines = Indirect Object (reason why: the Philistines received the riddle)
Riddle = Direct Object (reason why: this is what Samson gave the Philistines)
Because it is so old that it helps keep the feeling of the poem going
It is a list of sources that you may have quoted in your research writing.