Another “out” is that grandparents can skip inheritance taxes and pay for private school fees for their grandchildren. If homeschooling isn’t practical but the kids want their kids out of public school, grandparents can write that check and help kids escape from the public system.
It also takes away from the public system while helping the private sector alternative.
And this is done a lot. (grandparents with money paying for private schooling for the grandkids). But this can be seen as adversary if the children have decided to homeschool. It’s not supportive. Don’t bribe your kids to not homeschool. Instead, pay for their lessons or sports. A grandparent who approves of your homeschooling is worth all the tuition in the world!