Mezonos Maven: Mah Inyan Shmita Eitzel Har Sinai??
We are dealing with the parents chiyuv to teach their children both torah & umnus (which I am still waiting for a Mekor for the Petur of 13+).
I actually think the parents may want to rethink their outlook on life & get a rav (or perhaps homeschool) if they feel that they have no way of not being Over the Issur of Gezaila.
And yes, if the parents wish, they can homeschool for the Limudayi Chol and pay less, if the school allows. The only thing that this has to do with the OP’s question is that it is a possible job for a wife in the home (homeschooling).