Genderswap and Relationship Tags

For a character that has a genderswap transformation, when they are with a relationship, does their base gender get used for the relation or does their current transformed gender get used?

I thought of this after tagging post #2867653. In it, Ranma-chan appears with her mother Nodoka.

I've tagged it mother and daughter for now, but should it be mother and son, since that is their true relationship?

What about other relationship tags...?

Genderswap (MTF)

Genderswap (FTM)

Thoughts

For myself, I'm leaning more towards using the base gender. What do others think though...?

Edit:

That is, using the base gender when that's their true gender. If they are just a genderswapped version of a character involving no transformations, then I would lean towards using the genderswapped gender.

I'd go with the general guideline of "tag what you see".

In my opinion, the tags should be based on their biological gender depicted in the image. That should absolutely be the case with hetero/yaoi/yuri/bisexual tags at least. I'm more ambivalent on the family relationship tags.

Related discussion: topic #12534.