@Gednaa Oy. ☹️
Yeah, my Sim parent (single mom) was/is Good, Cheerful, and Family-Oriented. I had some trouble getting the toddler to do flash cards with her mom because HURT for no reason and being around mom made her SAD or ANGRY, but toddlers take like two or three days to max all skills in a micro home. Maybe four if interacting with their parent in any way makes them SAD AND ANGRY so they can't learn to talk or use the potty without taking a skill hit from the negative moodlets, or if being in a 32 tile space with a person makes them SAD AND ANGRY without even interacting with them.
As soon as she was a child I put mother and child in a club and bought strongest camaraderie, so there was a +3 Happy, and left the club on 24x7 to "cover up" any sad or angry. Camaraderie +3 Happy + Micro Home Feelin' Fine All the Time ended up piling on a bunch of green happy moodlets (tasty food! comforting night light!), which meant that the only effect the sentiment had was a little red or blue sliver at the end of a pile of green and silver-gray. It eventually wore off.
I also had some siblings where a child made a sand castle in Sulani and his little toddler sister knocked it down and HURT BETRAYED SAD AND ANGRY and I ignored it until she aged up and then had her apologize ("I'm sorry you're such a brat that you're holding a deep festering grudge against me for something I did when I was a toddler!") and they were besties from then on. But at least she did something, even if it was an overreaction.
All that said, yeah, we shouldn't have to do that. I shouldn't have to create a club so a mother can care for her child without the child being HURT, SAD, AND ANGRY that her mother exists over some imagined slight.