The parents will use what they have to send their son to technical school.这句话是否含定从,若含是什么?

问题描述:

The parents will use what they have to send their son to technical school.
这句话是否含定从,若含是什么?

那对父母为了送他们的儿子上工业学校(技校)会倾尽他们的所有.
有定从,they have是what的定从