This is a retrospective one.
My sister has recently raised a grievance/issue she has with me about an incident that happened years ago (about 15 yrs). She is aggrieved that I 'questioned her parenting' after I called at her house and found her then 6 year old son playing in the street alone (her house is in a suburban cul de sac).
Myself and my now husband played with him until she and her ex husband returned about 20 mins later (we tried to take him indoors at one point but were told the house was locked up). I don't know how long he was there alone before we arrived.
She then said they had gone into town to get cinema tickets (it was something like Harry Potter and they were in danger of being sold out). I can't remember whether she said he'd been left playing in the street with friends, or left playing in a friend's house. The whole incident was a bit awkward and her then husband was v temperamental (ended up being abusive) so conversation was limited. We took the dog (our main reason for calling) away for a walk and left pretty quickly.
My opinion was that; even if he was left playing in a friend's house, they should have made it abundantly clear to an adult that they were going out, locking up their house, and that that person was now responsible for their son (and shouldn't let him leave on his own).
I found it hard to believe they'd done that given how few people would let a child leave their house like that, but haven't had the chance to discuss it in detail as it was a touchy subject and myself and my sister have not been close/on great terms in the interim (this isn't isolated to me).
She also raised that I questioned her parenting 'after she was a single mother for yrs' (he marriage later broke down) .. but the incident happened when she was not a single mother so I felt it was clouding the issue.
Really I'm asking for perspectives on the scenario and whether you would have been perturbed like I was and later said something. (I cannot remember what I said but I fully admit I was disapproving and she has been angry/aggrieved about it for yrs).