Did you call the child support office? If he owes a back amount, then you should be able to enforce, through a contempt order or other means, like garnishment or collecting on a bank account.
The official child support enforcement agency in Indiana is the Child Support Bureau of the Department of Child Services.
Have you seen the state website on child support enforcement?
Here it is: http://www.in.gov/dcs/support.htm
The wrinkle here is that you gave your mother guardianship, which means that she should get child support. this is a complicating factor.
Still, guardian should get the SS check.
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