Essentially a prenuptial and postnuptial agreement are the same in the terms of the legal provisions that are covered. The only thing is a pre-nuptial agreement is more likely to hold up in court than a post-nuptial agreement. Courts have been reluctant to enforce the post-nuptial agreement because a spouse has a duty to take care of the other spouse. However, the trend in courts is that more than ever, judges enforce a post-nuptial agreement.
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See my prior reply to your duplicate post.
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