Option to have only blood relationships in "Set relationship"

that might explain things (and what I suspected) — but without knowing what logic is used – not exactly helpful – guessing the script is maybe done for efficiency vs “practical use”. Now, from that point it gets a big complicated on who want what and does want what. I would lean toward most people preferring Blood. However, this also connects back to my enhancement suggestion to have options and rules of how/when/what methods are used (or not)

Set Relationship - Enchancement request