My stepdaughter's father passed. Does his estate have to pay the court ordered back child support?

We live in the state of ILLINOIS. He owes my wife and stepdaughter approx 15,000 in back child support that was court ordered. He has passed on. Does his estate have to pay the court ordered back child support.
Update: The daughter is still a minor. We were putting the money from the back child support in a trust fund for her. There is money. The back child support is because he fought it, for 2 years. We are looking out for the daughter. His family is being real jerks about the situation and not wanting to let her have... show more The daughter is still a minor. We were putting the money from the back child support in a trust fund for her. There is money. The back child support is because he fought it, for 2 years. We are looking out for the daughter. His family is being real jerks about the situation and not wanting to let her have anything.
Update 2: we are not worried about the money that some people think. He took his life on sept 23rd. His family will not let his girls in the house to see if there is anything that they would like to keep for memories of their Father. It is not money we want. We are trying to look out for the daughters.
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