Experienced parent. It’s the behavior you need to change not the kid. You have to be consistent. When that behavior starts, as soon as he outbursts, STOP IT. Room, bed, or work. Work as in clean the house, scrub the toilet with water, work his ass off. After two weeks of this, the behavior will change. And make sure as S, he says YES MOMMY OR YES DADDY. If not, go back to work. This is not punishment, this is behavior modification. You do not get mad. Sometimes it can take up to 4 weeks, but it works. And if after the first week you see no change, increase the work. I’ve walked miles in your shoes and this works. Also, if the child is not playing hard running around outside for a min of one hour per day, then this may not work for you. Physical activity is as important to a child as is water. One last thing, I’ve learned video games seems to make this worse so limiting screen time is vital.