Stop feeding them.
Does he even have any assets anymore?
Didn't he abdicate any and all of his business responsibility to Jr when taking office the first time?
https://www.hemlane.com/resources/illinois-squatters-rights/
Requirements for Claim
The squatter must occupy the property for a continuous period of 20 years. This means using the property as their permanent home for 20 straight years. Occasional or sporadic use does not qualify.
The occupation must be actual, open, notorious, exclusive, hostile and continuous for the full 20 year period.
The squatter must pay all property taxes during those 20 years. Not paying taxes can invalidate an adverse possession claim.
The occupation cannot be permissive. For example, the owner granting a license or lease to use the property would not qualify.