Child Support for 18- and 19-Year-Olds

My question involves child support in the State of: Indiana
My daughter is 18 and enrolled at job corp studying for ged and my son 19 is no longer in school nor works and both live with me is thei father still responsible for paying support? He owes a substantial amount in arrears andi know he has to pay that but is he still resp for paying current support weekly?

what does your court order regarding child support say to the matter?

I suspect he is NOT liable for any further support but that does not relieve him of his arrears.