Why It's Hard to Tell a Phelps Parent From a Phelps Sibling

I realize what a conservative and God-fearing place Kansas is, so it's a little disappointing that they couldn't do a little more to discourage under-age sex:

http://news.yahoo.com/s/ap/20060518/ap_on_re_us/brf_marriage_age

My question is: Can you ground your daughter on her wedding day?