Back to the original question though, and the important point is that there is a difference between certification and training. I have taken uncertified divers on discover scuba diving outings, after a briefing/training session and pool orientation per PADI standards. They are not certified, but they are "trained" at a rudimentary level, emphasizing safety and very substantial limits on what we are going to do. They are "trained" by someone trained to train them and then they dive with that INSURED person under very controlled conditions. The OP presents a non-diver with absolutely no training "going diving " with an experienced diver who is not an instructor and I am guessing, not insured. That is folly on the part of each of the participants. I know this goes on, but that doesn't mean it is a good idea. With so many dive centers, with so many insured instructors who will give a friend a deal, there really isn't a need for this. I hope all goes well, but I do not endorse this type of activity, not as a dive professional and not as an attorney, either.
DivemasterDennis