""Precisely. That´s why mere liberties to do as the children please if they can does not make them all free. Making children free requires proactively paying for children whose parents´ financial capabilities are limited and proactively assisting and caring for disabled children.

Now we're talking about the differences between negative rights and positive rights.

No negative right guarantees that someone will have the resources necessary to meet that right. Maybe the party who wants to leave truly has no friend in the world willing to put them up. I doubt it would happen much. But it would happen for some.

However the so-called positive rights forcing others to assist are also no guarantee that they will be there AND have costs that necessarily take away from something else, perverse incentives to resist paying those costs &tc."

Yes. Due to costs and perverse incentives, attempting to provide positive rights may backfire.

But if you do not provide positive rights (whether you are unsuccessful in trying, or gave up trying), then you still cannot act surprised when someone with negative liberties but not positive rights winds up being abused.
So how would you react when you encounter an actual case of abuse?