Supposedly there are states that will recognize both the husband and the wife as the sole proprietor. I've not worked in one of those states. A sole proprietorship is only one person doing business as, thus the word "sole", but I have heard of married couples claiming that both are the sole proprietor, just becasue they are married.
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I can't herd the cats anymore, so I just set up the electric fences and let them fry when they stray out of bounds.