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Yes you could file criminal charges against the mother for conspiracy, solicitation, assault, and or battery. Depending on which state you are in the names of these crimes may differ. You should call the police and report the crime. Unfortunately unless you have independed corroboration of the acts the police may not do anything becasue they did not observe the crime.
In addition you may file a law suit against the mother for assault, battery, intentional and infliction of emotional distress. This will depend on what actually happened.
You may file the a similar law suit against all the ruffians involved including trespass.
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Please be aware that my answer is not legal advice, it is merely information and no attorney client relationship has been formed. You should always contact a local attorney for legal advice.