The commissioner is the one who could answer that question. He could check his records to see if he has ever dealt with this kind of situation.
I think there are more specific requirements in the code. For example, one cannot in any way favour one's personal interests or those of a family member. On the other hand, one cannot unduly favour the interests of any other person. The meaning of the term “unduly” is more flexible and therefore leaves more room for ambiguity.
In the case of very specific definitions such as for “family”, the approach to take is to ensure that you are comfortable with and understand these definitions.
In the case of the term “unduly”, one should first rely on one's own judgment, and if in doubt, consult the commissioner's office, stating that one believes one understands that meaning well, but prefers to know the commissioner's opinion for the sake of caution.