How you will improve all the children?

I agree that TS4 kids need a lot of work. I usually end up with a family that has a lot of kids and I would really love for them to be able to do more children like stuff, more special games between them and other kids, pranks, children's clubs, more after school activities, being able to react more like children to the world around them... I remember back in 2014 when I was playing new TS4 I had a kid and went with him to the park and all he could do was playing on the pirate ship... I was very disappointed... I so hope we will get some kind of generations pack where they will add these things.

Right now I use mods and I have a family that has now 3 children and with mods you can make the kids feel pretty decent and unique, but it would be nice if it was added in the official game at some point.

Give them playgrounds, slides, sandpits, treehouses, ect. I've found the things for kids to do in Sims 4 is all skill focused. They really need to add more play aspects for kids. They can build skills while playing. Also play interactions with eachother like tag, hand games, cops and robbers. Overall they need more play aspects and they will be good.