Semi-permanent toddler grudges

Hi, so I did find a thread about this a minute ago but... it was last updated in Feb and I've been admonished more than once for 'necroposting', plus there were two posts that proclaimed "No longer an issue" so I decided to try my own since it's still an issue for me.

I'm sick of sentiments already. It was bad enough that my parents were constantly flirty from being around a loved one no matter what they were doing (when teaching twin toddlers, that gets old fast). But what has gotten old even faster is my toddlers' tendency to hold a grudge against one parent until they age up, and I never age up my toddlers until their skills are maxed. This time it's the worst it's been yet, as immediately upon aging up from a baby (and then watching them both be put to bed at noon with critical potty and hunger needs, and making them wake back up, like always now...), the second-born toddler threw a fit at Dad when I told Dad to potty train him. Their very first interaction that I was able to induce, and the kid's had "Sad +2 Feeling Hurt' tacked onto his moodlet bar almost constantly. It gives a time of 2 hours and when they expire, it does go away. Then 1 Sim hour later it's back. And on and on and on as long as Dad is in the room, which he is because Mom teaches one toddler while Dad teaches the other. Frankly I'm sick to death of having a sad/mad toddler. -_-

PLEASE give up the option to turn these stupid things off!  

~Tyger <3

ETA: It's also meant that he has dropped far behind his twin in learning skills, since his twin is happy when learning, he's getting double XP while the sad one doesn't. 

And again: I was wrong, he's not constantly sad, he's alternately sad and mad. The sad moodlet went away and he was happy for an hour, now he's angry with "Angry +1 Still Upset" instead. Thanks so much, guys...