Since there is no evidence on title of the wife's community propery interest in the house, a probate will be necessary to adminstrate the disposition of the property. Probate Code 13500 et. seq.
Hope this helps.
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Yes, but evidenced to "whom?" Answer is: the probate court. Wife can't just march into the county clerk and record a deed from her deceased husband to herself. She needs to be awarded the property by the probate court.