[ARCHIVED] Cannot edit pre-existing sims (Family relationships)

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 is your current game version number? Newest
What expansions, game packs, and stuff packs do you have installed? Snowy Escape, Discover University, Island Living, Get Famous, Seasons, Cats and Dogs, City Living, Get Together, Get To Work, Parenthood, Dine Out, Outdoor Retreat, Laundry Day, Toddler, Movie Hangout, Perfect Patio, Luxury Party, Holiday Celebration
Steps: How can we find the bug ourselves? When trying to cheats are enabled and create a sim full edit mode is enabled. Editing household relationships (I.e making a male one’s father, or husband or brother etc.)
What happens when the bug occurs? Can you please fix the error that won’t allow me to edit pre-existing sims on cas.fulleditmode? I made me and my sister, before I made my parents and my little brother. So yesterday I finally made my parents and my little brother and I added myself to my parents family. For whatever reason it made my dad my stepfather and my brother half brother, and my sister is my dads daughter but not my moms daughter. So the family is messed up and it’s really pissing me off. PLEASE FIX THIS!! THIS DIDNT USED TO BE A PROBLEM!!
What do you expect to see? Household relationships should be fully changeable when “testingcheats” is on with cas.fulleditmode regarding of the sim was pre-existing. That’s the whole point of FULL EDIT MODE. 🙂
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? Yes
Please describe the patch or change you made. When I installed Snowy Escape and Island Living

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Can you please fix the error that won’t allow me to edit pre-existing sims on cas.fulleditmode? I made me and my sister, before I made my parents and my little brother. So yesterday I finally made my parents and my little brother and I added myself to my parents family. For whatever reason it made my dad my stepfather and my brother half brother, and my sister is my dads daughter but not my moms daughter. So the family is messed up and it’s really pissing me off. PLEASE FIX THIS!! THIS DIDNT USED TO BE A PROBLEM!!