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MCCC is a script mod that allows you to cheat various things for your sims. It is like the testingcheats cheat from sims 2. You can edit a whole load of things from a menu which you wouldn't be able to do in un modded sims 4. I can't remember what it stands for but if you search up sims 4 mccc there will be a website for it.
Do you have a solution for console? I create a woman and a son and a guy and a son. (Basically two single parents living together)
Somehow the son of the woman is now claiming the guy is father.