blondie:
That's been done already and the WTS won.
http://caselaw.lp.findlaw.com/cgi-bin/getcase.pl?court=US&vol=321&invol=158
Actually, the WTS lost Prince v. Massachusetts. The judgment (which was against Sara Prince, the witness) was affirmed by the court.
As the court stated: "Parents may be free to become martyrs themselves. But it does not follow they are free, in identical circumstances, to make martyrs of their children."