Let's say Dick and Jane grow up and marry. They get another dog and name him Spot, as well.
One spring day, as they're walking Spot, a neighbor passes them on the street. The neighbor notices Jane is "in the family way". She knows Dick and Jane are brother/sister and is familiar with the offspring prohibition. Upon arrival at her home she promptly notifies the authorities concerning her discovery.
The authorities arrive a the home of Dick and Jane. During questioning Jane explains that she and Dick wanted a family so they devised a plan.
Jane and Dick would go to bars and sit at separate tables. Jane would search out males with characteristics they wanted in a child and Dick would give either the thumbs up or down. After a few drinks Jane would leave with the man.
After a few similar encounters she became pregnant. The pregnancy was a result of a one night stand and Dick and Jane were anxiously looking forward to having "their" child.
So, should the authorities insist on DNA testing to ensure Dick isn't the father? Would Dick have the right to refuse testing? If he did refuse or testing showed he was the biological father should abortion be mandatory? Would you and other Conservatives support the State's right to forcibly confine Jane and abort the fetus she's carrying or claim that cute two-headed, five limbed fetus is a human being?
Those questions would have to be dealt with should incestuous marriage be permitted. Where would you stand?