You should conract an attorney and have a shareholders agreement drafted that contains provisions governing the rights of the founders (the two of you) to purchase the shares from the other shareholder if certain events occur. There are many reasons and provisioins that are contained in a shareholders agreement which should be drafted at the onset of the formation of a corporation. Seek a business attorney who can advise you on the typical provisions in a shareholder's agreements.
Hope this helps!
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Whenever an entity has two or more "owners" they need a "buy-sell" agreement to provide a formula for valutation and sale in the event of death, permanent disability, or desire to retire. Often there is a right of first refusal in the event of a third party sale. Other triggering events, such as divorce can be customized for your needs. Without such an agreement there is no public market for the equity - you may want to sell (or or in your case force a sale) and there may be to willing buyer.
If the equity in the company is deemed community property, the court would otherwise have the option to divide "in kind" as opposed to valuing for an equalization of community property.
The above is general legal and business analysis. It is not "legal advice" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here.
As others indicate, you should use a corporate attorney to draft a buy-sell agreement, and you should both have your spouses sign a consent of spouse accepting the terms of the buy-sell. To have a higher level of comfort that your buy-sell agreement and the spousal consents will be fully enforced in family court you and your partner should both have prenuptial agreements.
You need a buy sell agreement which states that should that if there is a divorce the divorcing spouse has no right to either share. This is a common clause between owners of companies who have spouses. However, make sure the spouses sign off on the agreement.
The above is not meant as legal advice but an illustration.
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