This can't be an Oregon question; I don't know what Orphan's Court is. There is a general principal in American law that when you bring a case, you have to state your whole case, all the issues involved, and once there is a decision you cannot file a new case based on the same facts.
Because you are talking about Orphan's Court, this is not a Michigan matter. You should consult with an attorney on this. You are very unlikely to be able to file an entirely new case. Appeal rights tend to be very brief in situations like this. You should consult an attorney right away.
We don't have Orphans Court in Michigan so can't help you - but my guess is that the answer to your question is NO - you have already had one bite at the apple and most likely your "new claim" would be barred by the doctrine of "res judicata" because the issue between the parties has already been litigated once.
You NEED to speak with an attorney. Cases RARELY get dismissed outright and it is even more rare that you could be successful on appeal. If you have a case, speak with an attorney, get a game plan, and proceed with your case.
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