What is your opinion about this ? Is it right that parents demand support from children in exchange for raising them?

To demand from the children isn't right. It's the responsibility of parents to raise their children and send then to school. Support in exchange of this isn't the right thing. The children should give their parents whatever they out of their own will and gratitude to their parents who raised them.

of course NOT..raising them is LOVE and not a job or responsibility.