I'm not sure. I think... yeah, I see what you're saying. I could have a "Santanas Mom" icon on my San journal, and just use that when the journal is being her mom? And a Papi, and a Nico, and so on?
As far as Diego... I don't know. If you and I could talk about the kinds of interactions you were thinking? I'd have a better idea of what I might like to do with him.