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Because CA is a community property state and there is a potential they could seize community assets for these separate debts, what you would want to do with a prenuptial agreement is create a separate property regime that opts out of the CA community property system.
The prenuptial would state the parties agree that all of their assets and debts acquired during the marriage and before belong to the spouse who acquired them and the parties agree to keep their assets separate and not commingle them.
In creating a separate property regime, not only do you keep your assets away from his, but creditors cannot come for your assets alleging community property laws in CA.
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