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I am sorry to hear about this situation.
1) A parent can sue as next of kin for a child.
2) To sue in a state court, one needs to have a "cause of action." There are numerous causes of action, such as "breach of contract," "negligence," "fraud," "unjust enrichment," etc., as well as causes of action rooted in statutory law. Every state has their own although they are very similar to each other in every state because they all stem from the same common law. A pleading in Court needs at least one cause of action, although it is not unusual to have more than one.
2) In this case, this may be a case for intentional infliction of emotional distress and assault/battery. Such lawsuits can win damages for loss of income, pain and suffering, medical expenses and punitive damages.
3) According to Michigan Compiled Laws section(###) ###-#### a parent can be held liable when an unemancipated minor, who still lives with his parent, has (in part) "maliciously or wilfully caused bodily harm or injury to a person." The limit on this is $2,500. However, the parent may also be sued for negligence because they failed in their duty as babysitter, and there is no such cap.
4) So the son/friend may be sued for intentional infliction of emotional distress and assault/battery. The parent may be sued under(###) ###-####to be tied into that, and under negligence themselves.
5) Damages are divided into two - actual and punitive. As explained, actual damages deal with loss of income, pain and suffering, medical expenses - whatever this amounts to can be requested. Punitive can be whatever the Court feels should be awarded, and can be in the thousands or even millions - most parties leave this open ended and the jury decides.
6) Strict statute of limitations apply so one wants to consider filing ASAP.
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