I am going to side with KeyandFill here, CC. You raise a fantastic point of giving the photos as a gift, but the caveat is when someone asks the happy couple who did the photos/how much they paid/etc. there will be a pre-existing notion that they can get a “deal”. This is not necessarily something conscious but it does happen more often than not.
I’ll just say, it’s usually safe to treat family different than friends but in either case if you give them a gift, the correct answer to the “how much did it cost?” question is “It was a gift, I don’t know how much it normally costs.” And, if I like family enough to attend a wedding, I would take gear and shoot it even if I just kept the photos to myself and put a set of prints into my wife’s personal albums.