My son is due to true 25 yrs soon. Can he go back and sue his dad for unpaid child support? I never received one dime from his dad. I was on assistance at one point and continuously provided his social, address, contact information and employment information, however, child support recovery never went after him. I do remember getting something from child support recover around tax time that indicated that $0.00 had been collected.

Frank (his dad) owes my son, not me. How long is too long to pursuit a lawsuit against his dad.

Thanks

... Frank (his dad) owes my son, not me. ...

Not if it's child support. If it's for CS, Frank owes it to you, not your son.