What should I put for "Relationship to Head of Household" if the correct input isn't available?

I was indexing some of the Gibraltar Census, where one of the fields is "Relationship to Head of Household", when I came across someone whose relationship to the head of the household is "Servant". The problem is, that isn't an option in the dropdown for that, and so it won't let me put that. I looked through all of the options and couldn't find anything even remotely similar. Do I mark the field blank? [MQC9-7DC]