If both individuals are US citizens and have a social security number, and if both individuals want a divorce, and if there are no issues concerning marital property, you parents should be able to obtain an uncontested divorce under the grounds of constructive abandonment.
Many attorneys (including me) charge a flat fee for an uncontested divorce. The flat fee allows an individual with limited funds to pay for a lawyer. If you want, you may contact my office. You may also contact a lawyer through your local bar association's referral service.
Mike.