PLEASE READ ALL OF IT What to do when family sticks their nose into a relationship?

Recently I had a friend asked me for advice and I have no idea what to tell the guy. He found himself hanging out with someone he has had a thing for for quite a while but she has always been unavailable. Four or five months ago she was around and was available and they started to see each other. Problem is iits my friends dad's girlfriend's granddaughter. So his family is fairly supportive except for the dad because he's caught in the middle but her mom her grandma and her ex have conspired and tried to sabotage this thing from the beginning and they hid it for a while but it came out finally. And when it did it was a nightmare and has been for the two but they still try. They're going other way too make sure something doesn't happen that they both need to both have some help they both need. They literally made calls to keep this help from happening to keep them apart. I really want to get my friend good advice here but I am totally at a loss at what to tell him so is there any advice or stories that you don't think might apply but they could be pertinent?
PLEASE READ ALL OF IT What to do when family sticks their nose into a relationship?
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