How are The Veldt and the Rocking Horse Winner alike?

They both portray the idea that Materialism, greed end in unhappiness. The Veldt shows that futuristic items, "machinery" will take over the need for love, and in The rocking horse winner, the mother does not love her children, she is hungry for money to satisfy the need. Her son tries to make his mother love her by giving her money, and in the end dies. & The Veldt shows that the children didn't need their parents love, they wanted the material things. So they both contrast and compare to each other in these ways alike. I don't know if that makes complete sense, but I'm trying to do an essay about the same thing, and that's somewhat the idea I have come up with so far.