[ARCHIVED] Relationships in Family tree are wrong

Product: The Sims 4
Platform:PC
Which language are you playing the game in? Deutsch
How often does the bug occur? Occasionally (10% - 49%)
What expansions, game packs, and stuff packs do you have installed? all of them
Steps: How can we find the bug ourselves? you would need to compare the relationship as shown in the relationship tab with the family tree
What happens when the bug occurs? nothing special happens...but if you click on the family tree the relationships are wrong
What do you expect to see? the correct family tree
Have you installed any customization with the game, e.g. Custom Content or Mods? Never used.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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My famlily tree is off. The daughter is shown as the child of a "non-existing" Sim and not as the child of her real mother.

The mother-daughter relationship is correct in the relationship tab.

It doesn't cause any problems (so far), but there is something wrong with the data.

Edit By Crinrict: Adjusted Tag