Back in the 90s as a child/teen, my best friends (sisters) lived across the road, and their mum was an alcoholic. She'd spend all day in her room, which to us was normal, and walk up the road to spend most evenings in the local con club (conservative club, she wasn't a tory she just went for the cheaper drinks and men), leaving my friends home alone. The younger sister would have been around 9/10, and older sister was around 12. This was completely normal to us! Their mum would have a boyfriend in tow who she'd meet at the con club and he'd be around for a while, then they'd split up.
Meanwhile we'd be roaming the streets (to be fair most kids went out unsupervised back then) but no one ever checked where we were or what what we were up to!
When my friends were around 12/13 and 14/15 their mum would go on a booze/fag run to france with her boyfriend and leave them home alone for the night. We used to have house parties when she was gone! Drinking/smoking etc. Crazy! But this was normal and would never happen nowadays!
What was normal for you that (for good reason) would never happen now?