Underage Van is able to marry Cheyenne without permission or support from either of his parents.
Reba tells Cheyenne and Van that you can get pregnant most days of the month. This is incorrect. Sperm can be mobile for up to five days, but once ovulation happens, the egg is only viable for about 24 hours. Therefore pregnancy can only happen if sex happens up to 4 days before, the day of, or the day after ovulation.