The parents must be willing to believe that their children can learn.
Unless your children are given a real opportunity to show you how children learn, to show you that it works, you will not see it.
The parents have to be
willing to see learning
able to see it
and
desirous of seeing it.
You can kill unschooling on the vine with "That won't work."
SandraDodd.com/playing
photo by Lisa Jonick