How does your partner/wife/husband address the instructor?

This is the protocol: non-class members/strangers should call my husband Mr Waller or Sifu Waller (unless they're personal friends).

A partner/spouse/family member of a student should call our instructor "Sifu" - just as a student would - because of the partner/spouse/family member being a class member.

In Chinese culture this is considered friendly because it acknowledges their indirect association with the school.