Partnered Sims turn into siblings

This happens with any couple but after reading this, I’m relieved to know that the issue doesn’t happen to only big families but small ones as well. I have a 10 year save and so far the issue has only happened to them. They have 6 kids together and two of the older kids live outside the family in their own homes and have their own families. When this issue happens where I go in cas with my married sims and come out of it, the couple becomes related but not only that, one of the older kids living outside the house turns into a half sibling to the other kids. I’ve shared this issue on Twitter so many times in the past and present, even tweeted this exact thread to The Sims account and Sims Direct. This issue has been ongoing for me for yeeears. I know I’ve mentioned it before but it saddens me because I’m so attached to that save and it’s 4 generations deep. My couple also has parents. The husband has his elderly mother whilst his wife has her elderly mom, elderly dad and 3 other adult siblings, plus 3 half siblings who also have families of their own. This issue of broken relationships doesn’t just stop at couples. It breaks and disrupts pieces of the entire family tree. Here’s what happens in a big family. My sim’s wife become disconnected from her own adult siblings on the family tree. Her parents are no longer linked to her but somehow she’ll be shown related to her husband while he shows up as a brother to her brothers and sister on the family tree. Then her husband’s mom gets disconnected from him. Then of course, only one of my couple’s older kids will show up as a half sibling to their other 5 siblings. My couple can’t be romantic with each other either. I’ve had this issue for over 3 years and no matter if I go to a previous save that is 2 years old or 5, no matter if I place these sims in a new save, regardless of if they’re from the same save or from older saved copies from the gallery, they still break the same way…. And you know what else, bet you that if there is a fix, watch the sims team claim to have fixed the issue but there won’t be an actual fix for our current saves that are broken like this. Why you may ask… because they claimed to have fixed this very same issue before where families became related and my save was still broken after the alleged update. The fix for that was several years ago and I’ve been fighting with them to go back and redo it ever since.