Why are hyphens used in the following sentence?
My brother-in-law came to our home this moming to visit and ask a favor.
because there is a conjunction in the sentence
because a quote is referenced in the sentence
O because the sentence includes a compound noun
because the sentence states a part of the day
I would say because the sentence includes a compound noun because the hyphens are to connect "brother-in-law" which is multiple words acting as one word.
