Toddler-Child relationship AND Family Embarrassment
What I've noticed on The Sims 4 is rather bothersome and annoying to me. You know how teens, young adults, adults and elders interact with a toddler in basically the same way? Pick them up, do flashcards with them, etc...? Children can't do that at all. In reality, it's acceptable and very helpful. I can't really see any reasons why a child can't interact with a toddler in the same way. I'm sure others are irritated by it as well. Heck, when my oldest brother was six or seven, he was allowed to pick me up, carry me, those kinds of things. So in The Sims 4, children should be able to do that stuff as well. It'll even bring them closer if you think about it. And if you don't want your child interacting with the toddler, just simply cancel the action.
As for my second subject, I don't think that a son and/or daughter should get embarrassed and get the "Privacy Invaded" emote when they are showering or using the bathroom, and their mother or father walk in on them just to wash their hands. Sure, they may not like it however, it's not like they haven't seen anything before. When their diaper was being changed as a baby and toddler, they've seen their parts those times. So why does it matter? They could just ask their parent to hurry up and leave, and get a bit irritated. In real life, it's not that big a deal. Siblings though, could be a little iffy.
I hope I have opened your eyes to something. If you get down to this part, I thank you for reading my little rant. What I think should be changed. You may agree, or you may disagree. Either is fine.