. . . It's like the little girl who was playing on my front porch: I told her she wasn't allowed to play there. "But my mom said it was okay!" I explained that it was my property, not her mother's, and I didn't want her playing on my porch. This little girl actually got the message, and it never happened again. It's possible that her mom did not actually tell her it was okay. Kids have a way of twisting words around. Once I overheard my SIL in the next room tell her daughter, "If you're going to play ball, you have to go outside, and you have to have an adult with you". My niece then comes to me and says, "My mom says you have to go outside and play ball with me".
Well, and also little kids have learned that "My mother said" can be incredibly powerful, so they use it whenever they're challenged. They learn that this isn't applicable through incidents like Sirius's.
When I was a kid, I lived in a place that was a cross between suburbia and the sticks. Between my yard and the neighbor's yard, there was an empty lot that was technically part of my parents' property. We didn't have it landscaped or anything, but we kept the weeds less than six inches high and were not allowed by ordinances to let it go to ruin. There were other vacant lots similarly owned and also some unowned fields.
Neighbor's kid had to walk the dog. If his dog did business on anyone's lawn, he had to clean it up. If he did his business in any of the vacant fields nearby, it was OK. Most of the time, neighbor's kid would not want to walk to one of the unowned fields and would get his dog to soil one of the vacant, owned lots. Ours was the closest.
We did not take kindly to this. I don't know what they fed that dog, but his droppings were fowl and the lot was a pain enough to keep tidy as it was. So if we saw him walking the dog, we'd ask him to leave.
He asked his parents for permission. But he didn't say, "Can I get Bozo to poo in the Flakes' empty lot." He said, "If I walk Bozo and the Flakes are playing, is it OK to play with them?" Of course his parents said yes because I grew up in one of those supposedly idyllic places where it was free play all afternoon for kids. He flaunted his permission in our faces when we would chase his dog off our property.
Of course, when we got his parents involved, they called us liars because he wouldn't have lied to them. (I think her words were, "My kids know they'd get a thrashing if they lied! They don't lie!" Oh really? But they have lied and gotten thrashed, right?) Those kids were such special snowflakes, I'm almost scared to know how they turned out.