You can date whomever you wish. The doctor would not have an issue since you are not a patient.
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This would be governed by the physicians' Rules of Professional Conduct. For attorneys, as long as your relationship started prior to the representation of a client, then it is not an ethical violation. As stated in the answer above, because you are not the patient is should not be an issue; however, you are the guardian of a patient so there could be a problem. Your boyfriend should consult his Ethics Code to make sure.
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