Clearly the implied background to question one is that the parents can ONLY request, not insist, else it would be no moral quandry at all- the Doctors would be obviously wrong.
But I agree with Corran. Just because something is difficult, or even morally grey, that does not stop it being a crime. Number 1 is murder- murder in an apparently humane cause is still murder, it is not a right the father has; you should not break a law like that without acknolwedging the consequences.
Number 2 is the girl caught out- if she cared about her Dad she would not have gone drink driving. You cannot make exceptions just because of her dying Dad, that is unfair on everyone else who gets so caught.
Number 3 is the simple application of official procedures. If Child support says it is wrong for the parent to give the drugs, then tough- it's their call, and not the Doctor's. It seems a very artifical situation- and also, it does not fit the basic topic of the thread. In this case, the procedure is not literally illegal- as noted, the drug is proscribed. What IS illegal, though, is to defy Child support, whose job it is to make these judgment calls. So it is not about it being a crime, the question is- is Child Support right to do that? Whole different issue.