For the record, I'm not specially ill disposed towards douglarization. I'm opposed to my children specifically marrying whites, blacks, or Vietnamese or whatever.
You aren't against intermarriage. You will just threaten to disown your kids if they do so. Kids as they are, and especially those raised in North America will do exactly that, just to defy you.
Should they go looking especially for some Indian from Guyana, or Trinidad, in societies where these are small minorities? Or should they find their love match, regardless as to who that person might be.
If you live in North America you are being very unrealistic. At the end of the day they have to live with their spouses, not you. So it is THEY, and not you, who will drive their decision. I suspect arranged marriages will not go over too well, and might even get you arrested if you try to enforce this, in a society where such customs are considered barbaric! And like it or not, the values possessed by your kids, reflect not only what they learned in your home, but also by their exposure to the outside world.