Suicide prevention is everyone's business, but it is also the business of the loved ones of the suicidal person. Suicidal people always give clues about their distress. People don't always pick them up. We don't always have access to the total picture. Every individual has a piece of the puzzle, and it is when you assemble all of these pieces that you can understand what state the person is in, what needs have been expressed and what signs of distress we should recognize.
As for the care that needs to be provided to the suicidal person, the family has privileged information. The resources and care we can provide to the loved ones will also help them to get through the crisis, to play their role properly and to become a bit more solid.