Autonomously fighting loved ones

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? City living, get together, get to work Parenthood, vampires, Dine out, spa day, outdoor retreat Bowling night stuff, vintage glamour stuff
Steps: How can we find the bug ourselves? Have a household of vampires, mostly related with each other, wait until they start autonomous duels.
What happens when the bug occurs? Relationship levels drop from true friends to acquaintances or worse. Since parenthood it shows "conflct resolved" after the fight yet a full green relationship bar goes down to 25% relationship level.
What do you expect to see? I expect a duel without a loss of relationship or at least not a 75% loss of relationship.
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 

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Having a family of vampires and this makes it a must have to install MCCC to counter the insane relationship loss. I dont see why vampires with good or great relationships duel all the time. They should spar anyway. This should be something for vampires with negative relationships.