I have found it unproductive to yield to threats, dude, and I would urge you to reply as follows:

Son, my marital issues are over. Your mother and I have been working to repair our union and do not need interference from any not-fully-mature smart-a$$. Whether or not I ever see you again is, of course, within your purview, as is, I would remind you, the option of paying your college tuition within mine. If I ever again hear from you on this subject, in any way except to ask what assistance you might provide to help us heal, my decision in the matter I mentioned will be made not to your likely satisfaction.

So, will you be joining us for a peaceful, pleasant Thanksgiving, or actively looking for alternative college funding?

Love, Dad