In direct response to the OP's question "When I go...What then?"
First of all, speak to the people who are close to you about your wishes. Speak to your aging or sick relatives about their wishes. Afterward, you may find your relationship with that person even closer than before. It may seem like a difficult subject to breach but you'll both probably end up feeling very good that you did.
Second, put your affairs in order. For some that might mean a simple Will. To others it may be a Living Trust. Regardless, get it done! The first and most important part in taking care of you or a relatives Estate will be that the proper documentation is in order. You can always go back and make changes to these documents whenever you find it necessary. But, without them you are at the mercy of the courts. If you have certain sentimental items you want directed to certain people, put it in writing.
Third, make sure all the T's are crossed and the I's are dotted. This means making sure the small things like savings account, CD's or a life insurance policy all indicate who the beneficiary should be. As an example, you or your parent may have indicated a beneficiary as a deceased sibling or relative and that account was never updated.
Having your affairs in order is not hard and can be a great feeling of relief and accomplishment for everyone involved.