Well, let 'em. It IS a fact that it's legal to marry your first cousin in Texas, even your double-first cousin (just like AL, GA, FL, SC, TN, VA...and get this: NY, CT, VT, RI, NJ, MD, CO, NM, CA, AK, HI and DC!) (Search engines are wonderful things.)
Oops! I forgot to add MA to the list.
Good Lord, what are we coming to? Soon everyone will have tails. But I do understand that marrying a first cousin is really not risky unless there is a genetic recessive disease in the family.