How can I appeal a court order in state of IN

can you get a court order throw out: if subject a is the petitioner and b the respondent and the court orders the pet to pay the support and all theses yrs the respondent has been paying can it be thrown out of court can i stop it, the kids are 19 i have him and 18 out of school and 17 soon to be 18, do i have a chance to have it thrown out ? it is signed and stamed court order - Is this your question? Add additional information