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I am sorry your son is dealing with this situation. First, your son did not commit the damage and can not have felony charges filed against him. Second, it is unlikely the police will get involved as this is a civil matter not a criminal matter.
However, you son still being on the original lease does create some issues and he could be held liable for the damages because he is on the lease. Mitigating that liability would be the fact that the landlord permitted the occupant and therefore he should not be held liable for the full amount of damage.
In addition, if your son is sued for the damage he can name both the occupant and the person she allowed to stay as a third party and basically to the extent he is held liable they are liable to him. This results in at least sharing the cost of the damages but possibly being reimbursed for any damages he is held liable for.
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