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I'm Lucy, and I'd be happy to answer your questions today. I'm sorry to hear about your situation.
California law allows a spouse to give a gift of separate property to a spouse, turning it into community property. However, that gift must be accompanied by an "express declaration." If you did not sign something stating that you intended to give your wife a gift of half your inheritance, that money remains your separate property and you're entitled to get it back. Cal. Fam. Code, Section 852. The same is true of the vacation rental if that money came from your investment account - but in that situation, if you didn't add your wife's name to the property, she doesn't really have any claim to it in the first place. Property purchased using separate property remains separate property under Cal. Fam. Code, Section 770.
She's entitled to keep whatever money was in her retirement accounts before the marriage, however, contributions made into those accounts during the marriage are considered community property, and you have a right to half that money. She also has a right to half of whatever is in your 401(k)s, but you can agree that she just make an equalizing payment to you from one of her accounts if there's more in those. If the money in your 401(k)s is more or less equal to what she's added to her retirement accounts since the marriage, you can also agree to just keep your own accounts.
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