The recorded deed is a starting point for seeing how ownership is listed. California generally treats property acquired during marriage while a spouse is domiciled in California as community property — marital property under state law — unless an exception applies. The recorded deed, how the house was acquired, and any divorce judgment, agreement, or court order can all matter to a sale.
Those general facts do not answer who can sign for a particular house. The title company reviews the deed and closing documents for the signatures needed for this transaction. A California family-law attorney can explain how an agreement or order applies to your situation. You can talk with us about the house while that review is happening.