I don't know if this is standard 3 year old behaviour. I don't have children. I live alone below a family of two parents and one DC. She is constantly running about, banging, crying and screaming the place down. It is so loud it makes my furniture rattle. She will shout and yell at the top of her voice, most of the time this isn't an 'upset' noise more like frustration or tantrum. Often the parents will just yell back at her making the same noise. This starts around 7am and will continue late into the night - the child has no discernable routine. She is clearly very energetic but I rarely see her being taken outside, either to their large child-friendly garden or to the local park (I work from home so am very aware that they almost never leave the house). I am listening to this right now, she is obviously trying to attract parents attention and is just making a repeated erhh eeerrhhh noise at the top of her voice. It's so fucking loud.
The noise sets me on edge, annoys the shit out of me and makes my cats jump. I see them sometimes taking bins out, etc and they seem nice enough people, just no thought to the impact their constantly screaming child is having on those around them.
I'm expecting responses along the lines of she's a child, what can they do.. I don't care really I just don't see why my work and my enjoyment of my home space should be so severely disrupted throughout the day just because two people decided to procreate.