A trial court is the court where a case is first heard. It primarily answers questions of 'fact' such as "Did Bob commit this crime?", or "Does Jane own Mary this money?".
An appeals court hears appeals from the trial. It primarily answers questions of 'law', such as "Did the trial judge make a mistake in allowing this piece of evidence in?".
A criminal case is one where the government alleges that the defendant has committed a crime.
A civil case is a dispute between two private parties over money, or some other "valuable consideration".
OK....this is a first, but I'll try. When a person establishes a will, they include all orders/wishes that are to be carried out upon their death. The person maling the will would normally name a person who is to take care of there child if they die before the child becomes an adult( in most states, this person is considered the "Tutor" of the child). So if there is something left to the child that is unreasonably ascertainable to the child at the time of the parants' death, it is put in the control of the tutor until the child becomes of age. This is also true with guns, homes, cars, etc.....