Help him learn not to get tripped up on the questions they train the JW to answer.
DEFEATING SERIES #1:
Have her attorney ask, "If your daughter was in an accident and her life was in danger, would you accept any available medical care to save her life?"
The likely response would be, "Anything but blood. But any non-blood substitutes would be fine."
Followup, "What if there is no alternative treatment available and she would not make it to a facility that offered such care? Would you deny a transfusion under those circumstances?"
DEFEATING SERIES #2:
Have her attorney ask, "Do you believe that your ex-wife is going to die at Armageddon?"
The response will be, "It is God's place to judge, not mine."
Followup, "So, have you shared an opinion on that point with your daughter?"
Squirm, no doubt.
Followup, "Have you exposed your daughter to training that would cause her to believe her mother will be destroyed by God at Armageddon?"
I am sure others can come up with more.