Spouses still related since 17 March patch

I know this issue came up before after Royalty and Legacies was released, whereby spouses became siblings. Well, since the patch on 17 March, it sort of corrected the problem. Unfortunately, my Sims are no longer siblings, but now their parents are siblings, meaning that they are cousins. I need a solution to be able to edit or delete these relationships, so that my Sims can a married couple again. I have used tried both full edit CAS and mods, but nothing can correct this error. I even tried to fully remove the Sim from the game (deleting them). I'm worried that I'm going to have to fully delete every member of the family tree (which is huge) and start over. Please, tell me that there is a fix or that another patch is coming to address this.