I am sorry to hear of this.
First, it would be important to know what was signed. If it was a marital settlement agreement, the court will enforce what is agreed to so long as the parties were of sound mind, were not under duress, and the agreement was properly executed.
The agreement cannot be a result of undue influence (please see the Bond case, here: https://scholar.google.com/scholar_case?case=15970282768111903962&q=marital+settlement+agreement+unconscionable&hl=en&as_sdt=4,5)
In that case you will notice the court considers many issues, such as whether there is full disclosure of assets, undue influence, knowing waiver, etc.
The court also noted that for both premarital agreements and marital settlement agreements, the court may consider whether one had adequate legal counsel.
Please see section 4 of this case (https://scholar.google.com/scholar_case?case=9900217822238642137&q=marital+settlement+agreement+unconscionable&hl=en&as_sdt=4,5) regarding setting aside marital settlement agreements.
It is important to meet with an attorney as soon as possible to go over the terms of the agreement (and to determine exactly what was signed).
For example, typically the parties will exchange financial disclosures (ie FL150; property declarations) so that both parties are aware of what they are signing; failure to do so can result in the agreement being voided.
Lastly, a party may agree to waive spousal support, or may agree to termination at some future point, based on the ability to contract freely (this is not permitted with child support because a parent cannot "waive" or otherwise negotiate less than the statutory amount of child support, absent judicial approval; there is no similar statutory guideline or judicial approval required for spousal support).
A party may waive the required financial disclosure (http://www.courts.ca.gov/documents/fl144.pdf) but this needs to be clearly set forth in the settlement agreement. However, the family codes discourage waiver of financial disclosures and in some instances preclude this (see Family code 2100, 2104, 2105)
And with marital settlement agreements, basic contractual provisions apply (per Civil Code 1566-1579) so that one may void an agreement based on fraud, undue influence, etc. Furthermore, the Moore case, and the Olsen case, recognized that spouses owe each other a fiduciary duty (utmost good faith) that continues until the property division is effectuated, and that waivers of spousal support, especially for long term marriages (marriages longer than 10 years) require judicial scrutiny.
So as one can see, there are many concerns here and it is important to have an attorney review the agreement, and in particular review what type of disclosures were made and whether the fiduciary duty and basic contractual law was violated so that the agreement may be voided.
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