(a) Marriage contracts and postnuptial settlements shall be enforced at the instance of all persons in whose favor there are limitations of the estate.

(b) Antenuptial agreements may be enforced by a court of equity at the instance of:

(1) The parties to the marriage; or

(2) The offspring of the marriage and their heirs at any time after the death of a spouse, subject to Code Sections 15-9-30, 23-1-4, and 53-7-40; provided, however, that when enforced at the instance of such offspring and their heirs, the court may enforce in favor of other persons.