Despite the calls of racism – I pretty much know what your concern is – it’s concern for both of the kids facing racism. As well as the religious/varying Christianity aspect being in the way. Is that correct? If not – I’ve got nothing for you. If so – read on:
I HIGHLY suggest you drop the term “person of color.” It sounds racist. Drop it entirely. Nobody needs to know the color of her skin and it shouldn’t matter. If your son were dating a woman of his own race would you start a sentence with “Billy is dating a girl with brown hair?” No, you wouldn’t.
Unless, of course, people ask you. Then you need to find out how she prefers to be addressed. Some women like “black” some women like “African American.” Respect her wishes. (I am assuming this is a black woman, if she is Hispanic, Asian, or some other “color” please clarify.) My mom has dated men of just about every race, and I have been raised with their children, as well as a Vietnamese family so I am often clueless about racism or “color”. When it has hit, it has hit home hard, and mean, on my soul. So THINK before you speak, please. Not that you don’t have a valid question.
On that – yes I DO have some very good experience. One of my closest, dearest friends is a black woman (her preference of adjective) and she is married to a huge, strapping Scottish man, of the Highland Games variety. They have a beautiful child together, and have a very successful marriage. Now my friend, she was quite a big to-do in the corporate world before she gave birth, making far more money than her DH. She has given that up to raise her child. However, she does work part-time (with a degree in psychology, outside of her amazing career history) as a family therapist. Yes, this man has done quite well by having her as a wife. As I have done quite well by having her as a friend. Her presence in my life is something I thank God for often. She is truly a wonderful, amazing and giving woman. She is also Catholic, she converted before her marriage.
So advice – you want advice. What I am about to say is probably going to be hard to take, but is something I know personally about my friend, from my own past experience, and which is shocking to white folk as a whole:
Your son isn’t doing her a “favor” by dating her, or if it should go further “marrying her.” As a whole, this girl, no matter her race or “color” is probably going to face a lot of racism from her OWN FAMILY about her choice in a boyfriend, much less a husband. I HIGHLY suggest you educate your son about this. Marrying in to, or even dating someone of a white race isn’t a “blessing” or a “favor,” or even a “stroke of luck” – it is what it is.* Love IS WHAT IT IS*. So if you want to know what to do: tell your son he is never to act
superior, never to act
like he’s doing this girl a favor just by dating her. If he does, he’ll look the FOOL in her eyes, and the eyes of her family. That will never work for either of them. You want your son to date a woman who respects him, not rolls her eyes and hurts in her heart every time she thinks about some flippant remark he’s made that sounded not only racist –
but superior.
Hope that helps! If you utilize my advice and approach your son with this he’ll probably respect you to no-end, and hopefully he’ll respect her to no-end too. Either way – you win.
Oh and to reiterate what someone else suggested: ask her to bring a dish! What better way to make a woman feel welcome than to ask her to bring her favorite recipe?
Do come back and update us on how Thanksgiving went.
God Bless!
Most especially if the two are well educated and motivated people. Just be supportive of your son, and hopefully the gal will bring a nice dish to Thanksgiving dinner which displays her culinary talents! 
Also, be cognizant that the girl may have apprehensions of her own, so relax and everything will work out just fine.
I don’t know why people get so hung up on skin color.
