In the Carpenter home, every meal begins with a prayer. Robin and his wife, Emily, are devout Christians. But they part ways with many other Christians over a measure that would expand the legal definition of human life. Their son, Luke, now 4 years old, was born through in vitro fertilization. The anti-abortion amendment being voted on this week in the state could restrict in vitro procedures, and the Carpenters are worried that if they wait too long to add to their family, they may end up breaking the law. "I don't really want or need anybody else getting involved...