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I am sorry to hear that you have run into this problem with ex's behavior in choosing tenants. And I hate to have to give you bad news, but unfortunately you don't have any legal authority to object to who he chooses to rent to, regardless of their background.
However, you do have the power to ask the court to prevent your son from being around criminals who will exert negative influences on your minor son. So if you can get their actual identities and confirm that they do have extensive criminal histories, that would give you grounds to file a motion to modify the custody order to have him live with you so as to not be around these negative influences.
The judge has a duty to make decisions that are "in the best interests of the child" and it definitely wouldn't be in son's best interest to be surrounded by this type of criminal element.