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I'm sorry to hear about your situation. The fifth amendment only protects you against self incrimination. The key part of "incrimination" is the "crim" part, which means criminal. That is, if the answers that you would provide would incriminate you (confess a crime such that you could be prosecuted under criminal laws) then you could invoke your 5th amendment right against self incrimination. Otherwise, if you refuse to answer the questions, you can be held in contempt of court.
Now that being said, you can still strictly answer the questions, in that you don't have to give more information than you're asked. For example, if you're asked if you know the time, you can say "Yes." You don't have to say "It's 3:30" or whatever. And if you're not 100% sure of the answers you can always say "I don't know" or "I don't remember".
The only privileges (other than against self incrimination) would be attorney/client, doctor/patient, or marital communications.
In any civil proceeding, a person has a privilege to refuse to disclose, and to prevent anyone else from disclosing, any confidential communication between his spouse and him during their marriage, regardless of whether he is married to that spouse at the time he objects to disclosure. This privilege may not be asserted in any proceeding in which the spouses are adverse parties, or in which either spouse is charged with a crime or tort against the person or property of the other or against the minor child of either spouse. For the purposes of this section, "confidential communication"means a communication made privately by a person to his spouse that is not intended for disclosure to any other person.
So the marital privilege may be relevant, but only so far as it concerns actual communications between you and your spouse that were intended to be private in the first place. If that's the case, you can claim marital communication privilege. But otherwise, you'd have to answer it, even if your answer is that you don't know or don't remember.
I know this is probably not what you wanted to hear, but it is the law. I hope that clears things up anyway. If you have any other questions, please let me know. If not, and you have not yet, please rate my answer AND press the "submit" button, if applicable. Please note that I don't get any credit for the time and effort that I spent on this answer unless and until you rate it positively (3 or more stars). Look for the stars on your screen (★★★★★). Thank you, ***** ***** luck to you!