If anyone is known for doing absolutely everything they can for the ones they love, it's you. So now, when a loved one comes to you for help, there's no reason to believe that you'll act any differently. This, however, may be a situation that's trickier than the last few you've dealt with, especially since it will be quite unexpected. If you can help without injuring yourself or your reputation, do it. If not, bow out and find someone less involved who can.