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You asked "is it true" and Weblaw points out, quite correctly that while you cannot own a part of your wife's practice, you may own an interest in the physical office (the real estate) where she practices. FYI, you can also own and lease her equipment if you wish. The owners of medical office buildings, clinics, hospitals etc... do not have to be licensed physicians.
I'm not asking about anything else except the BUSINESS that I buy with my wife. Don't mess me up with real estate and equipment. We buy the business with patients, it's it.
"Is there other way for me to get protected on my investment of time and money?"