My uncle works full time - he pays under the table. Uncle uses her money for his Son's. Uncle does not by my Granny cloths. She cannot have visitors or friends unless Uncle approves. Limited time to visit. She can not see very well, Uncle had her sign the deed/land over for care.......he does not do the work / cheap hire. would you report him ?
https://www.agingcare.com/questions/is-this-elderly-abuse-187630.htm
If your Uncle is working full-time some place else then I see no problem with him hiring others to do the work with the land or a farm, I assume it is some type of farm.
Curious how you know how your Uncle pays the help, or about Grandmother's clothes? Is he telling you that, or is Grandmother?