[FIXED] [RGSP] Wishing well fails to add child to family

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What expansions, game packs, and stuff packs do you have installed? all
Steps: How can we find the bug ourselves? 0. Play a household of only 1 adult sim. 1. In buildmode, place "Whishing well". 2. Click it > Make an Offering > Present $5000. 3. Click it > Make a wish > Child.
What happens when the bug occurs? The child appears near the wishing well and he shares household sim's "family name". However, he is not added to the household after the animation. And the active sim --- child relationship is "acquaintance" only(not 'son'). I also received this error: "Exception in Sim Timeline: Exception running Element (AttributeError: 'RelationshipTracker' object has no attribute '_clear_relationships')"
What do you expect to see? "A child is instantly added to the household, usually with the genius trait." according to sims.wikia.com/wiki/Wishing_well
Have you installed any customization with the game, e.g. Custom Content or Mods? Not now. I've removed them.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

‌

.............