People: Brother-P Child-W My brother asked me to babysit a few days ago and I said yeah why not. What I didn't know was that his 4 year old son wasn't potty trained so P said to keep asking W every so often if W has to go potty, so I did. Every 20ish minutes I asked W and he kept saying no so I said "do I have to check" And W responds with "I popped myself a long time ago" I'm 19 with no younger siblings so I've never changed a diaper before until a few days ago, it's was a 4 year olds diaper so you can imagine the smell(sprayed fabreeze in a mask and I still almost puked 4-5 times). P then came home and I said "W lied about it and he said he pooped himself after I asked him about 10-15 times" P then said that his child lies about it and it's a normal thing. So am I wrong about saying I won't watch his kid unless he's potty trained?

TLDR: watched my 4 year old nephew, and brother didn't say he was potty trained so nephew lied about pooping himself and brother said it's fine he lies about it. Also never changed a diaper before and I'm 19.

Also aren't 4 year olds supposed to be potty trained in general?

Edit: brother is having marital issues but neither him nor his wife(whatever tf she still is) haven't taught him to do shit on his own. The kid doesn't even use "I want" He says "me want" And he doesn't listen for shit.