I see. Thank you for clarifying that for me.
If your brother does not respond and the case is dismissed "with prejudice", then that means he cannot file another lawsuit to pursue the same causes of action ever, he would be barred from doing so by the dismissal order.
However, most cases are dismissed "without prejudice", which permits the plaintiff to file suit again in the future as long as they file within the applicable statute of limitations
For example, if someone is claiming fraud, they would normally have 5 years from the date of the alleged wrongful act to file suit. If the first suit was filed after 2 years and dismissed after 3 years, the plaintiff would still have 2 years in which to file suit again after the claim is dismissed.
Here is a link which sets out the various statutes of limitation under IL law:
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