Rebellion will now be in effect for both teens. I hope you have some sort of communication with you son that is not all one sided to your benefit. He needs to know you listen to him, you care for him, and you are watching out for him while he makes his own choices. Teens with bf and gf have a mindset dating site for 15 year olds if patents don't show them any respect for the feelings they have for each other then the parents just doom themselves. So you hate her, her parents probably don't like him your son either because his parents you insinuate that their daughter is trash.
You need some open communication without judgements and just listen. You will be driving them together out of spite. You have gotten some excellent advice from the mom's here.
You do not mention My story and I am sticking to it is my eldest son got his first GF around this age.
Even in high school i crush on my older teacher thirty-two and i was only sixteen or fifteen,and at 17 another teacher, so there you go lol I personally knew i would marry 1 day older, and i do not care if she is way older, i try to stay under 20 years older but will go as high as thirty years IF we connect more than just the great sex with an older woman.
I love older women. IMO they are not old yet, just Older women. I will marry an older lady, over 10 to fifteen or 20 years and i am going to be happy with just that.
Both of us growing old together and as ONE happy unit. We sure can adopt if we choose.