Need advice please!!

[Mandy]

How would you ladies handle this??

My son is 17 and going out with this 15 year old.
I have no problem with him having a girlfriend, and I realize everyone has very different personalities, but this is too much for me.
She comes here, doesn’t greet when she walks in, doesn’t talk unless we ask her something.
When my son asks her in front of us, if she would like something to drink its either yes or no she answers with, when she leaves she says, goodbye, and that’s it.
Her parents are divorced and she is living with her father now and his new woman, she doesn’t get along with her mom, and likes to talk about her behind her back.
The stories come back to me via my son.
Her mother has a 24 year old boyfriend, and she doesn’t like the setup, right I do understand that it must be hard for any child to live this life, but the way she treats my DH and myself in our home is something we can never allow.
This has happened too often that she sits laughing and talking to my son, the minute my husband or I walk in she stops talking, and drops her face, and has given me the look for wanting to sit there for 5 minutes to have a smoke (we smoke outside)
We have tried our best to make her feel very welcome in our home, and really, she could have had a good time with us!!!!
I don’t like the sly side of her, there is no need for her to be this way.

Yesterday my parents were here, she walked in and never even greeted my parents, I was so embarrassed!!
We have always told our son to hang around with people who can mean something to him, and never to mix too much with people that drag him down to their level.
Last week I told him that he is too young to have a steady girlfriend, and to go do things with his friends, she is taking up all his spare time.
When she sms’s him, he jumps!!! (although he doesn’t admit it) we have witnessed it many times.
When we go places, he keeps watching the time because she is coming and has to be back in time!
We cant choose their wives or husbands, but darn it he is 17!
Do I forbid him to see her? Do I forbid her to come here? Last thing I want is that he sees her without us knowing about it!

I realize we cant tie them to our apron strings forever, but I sure do want whats best for him, I don’t have a problem with “letting go” but I can not see what he sees in her.
When we ask her what she would like to do in future, oh she doesn’t know, hasn’t thought about it.
Her aducation level is high, but isn’t interested!

Advice and opinions are welcome!!!

Sorry this is so long, but thanks for taking the time to read.