Need critical guidance please. My ex was imprisoned soon after we got separated and this couldn't pay support.

Need critical guidance please. My ex was imprisoned soon after we got separated and this couldn't pay support. He has been out now for various years. I paid for everything while he was in prison as the 2 kids were minors. They are currently independent, however it destroys me that he emerges from jail and is carrying on with the existence without any concerns on the planet and the 3 of us endured. Nothing that was endorsed in the legal documents was at any point paid/done by him. I knew about somebody who won a case for antedated upkeep as of late endorsed by the protected court. Is there at any rate I could sue him after the 10 years we've been hitched, as evidently support can be asserted until 30 years
How would I approach accomplishing something like this and could it be pricey? My girl is getting hitched and I need to give the support cash he ought to have given to her to assist with the wedding costs