Can’t edit sims relationships in CAS

I had to move all my sims to a new save because of an ongoing issue with neighborhood stories not working properly. When i moved all of my sims over I took my main sim and her parents and put them into a household with all of her siblings I had to move over with their families, in order to set their relationship but upon turning on testingcheats true and then cas.fulleditmode I only have the option of making them partners. I moved them all apart again and then picked one sibling and put her with her brothers family her brother can still only be set to partner but her sister in law can be set to sister. No idea what could be causing this issue. I don’t use mods or cc so that can’t be the cause