Oh God, please leave this poor family alone. I know your intentions are good, but for heaven's sakes, let Terri have SOME dignity.
There are witnesses other than the family, like the lawyer who is quoted in this article.
If I buy that a family member wouldn't or couldn't do this contemperaneously, I still believe the family would almost certainly support release of real pics (what do you think they've been doing at terrisfight.org all these years?).
So I can't see a substantive argument against some other witness assisting in a compter rendering.