I agree with cammom, eco21268, Ivy, and others who suggest working on marital communication and focusing on the child's needs and interests.

Early college experiences need not be fraught with angst and/or a sense of social exclusion due to being under age with a perception that campus social life is centered on drinking and/or sex. Many students successfully find a group or activity for healthy social inclusion (campus jobs, ski club, service clubs, and fitness center activities such as zumba, yoga, and weight room are just a few examples for meeting students with common interests, outside of classes). YMMV.

In addition to early high school graduation and matriculation to college, there are numerous other ways to secure placement of a young but highly accomplished student in a college or university course. This article from the Davidson Database provides many successful anecdotes, creative how-to's, and helpful resources.