I agree with both James and Christine. Your best option is to hire an attorney to write a demand letter - that is also the most cost effective. To go to court would be much more expensive and an uphill battle for items that are potentially difficult to "prove ownership" The real difficulty are the emotions that you must go through because the items probably have more sentimental value than monetary value. I'm sorry for your loss
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Yes. You are required to list all your assets as well as debts but you can note if any of them are your sole and separate property
Yes - when there is a retirement that needs to be divided and a home that needs to be determined ownership - then you would be wise to get an attorney to protect you.
It really depends on the language in your MSA so it is difficult to give you a complete answer. In general, if the MSA waives support then you cannot "change your mind" at a whim. There is a statute of limitations of one year to set aside a divorce unless you can prove fraud etc. One of your best options is to seek a consultation with a family law attorney to review your MSA and options. Sometimes when there is "a change in circumstances" support can be increased or decreased Good luck to you
No - you can only be married to one person at a time or you are committing bigamy, which is a crime! Get a divorce first - California is a "no fault" state so you can get a divorce for any reason.