Do any of you add a fact when you confirm a relationship through an obituary or death certificate?

I've been trying to determine the best way to do this because I think it's a good idea to show "proof" of the relationship when there are no other sources (i.e. census record).

I was originally attaching the obit or death certificate source citation to the person's name, but that doesn't show in the tree on ancestry.com.

What to name the fact? I'm thinking something along the lines of "relationship confirmation." Thoughts?