You can talk to your son. I wouldn’t say anything to GF.

Is she living at your house or is she there everyday including meals? Do either them have a summer job? Remember your house = your rules. Enforce a limit on their “in your house” time.

My nephew brought home his college girlfriend and she talks non stop. However it has been good as they have never lived together and now spending 24/7 together for a couple weeks has led to him seeing her a little differently. Chatty is cute on a date but non stop talking around the clock is a lot less cute. Being together all the time and with family gives them a new perspective on their partner.

Ignore it
It’s a first GF, unlikely to be around forever

Thanks for the responses. I got what I needed.

And about the “cues” yes I realized that after but …

Its hard to mend severed relationship with adult children so be patient unless it's something damaging. If you do want to discuss it, first think it through.

If she is living with you, you can set rules, expectations and if she doesn't live by them she is not welcome over.

I think the answer depends on what kind of relationship you want with your son. If you don’t care then do what you want. But otherwise do 1. And how is it ever appropriate to sit a guest in your home down and criticize their method of interacting.

Social *cues

She sounds like a smoke show. Let the boy have his fun.

Your son is driving you nuts and he has a girlfriend. That doesn't make her the problem. If you don't like how he's acting, talk to him. Leave her out of it.

What the hell are you trying to say?

Examples, please.

Drug test him

Son came back from college with first real GF. They are inseparable. Son’s brain functioning seems sub optimal in her presence and his ability to decipher social queues, while never a strength, has completely vanished.

We only have a few more weeks of this madness so should we 1) just endure it; August will pass quickly 2) sit them both down and explain how polite people interact with other family members or 3) banish gf for remainder of summer?