What is the ruling on trimming the sideburns before the beard grows, and what if the parents order them to be shaved?

The beard begins from the 'athar (the hair growing on the bone opposite the ear canal) and below it, and the hair growing on the cheeks. All of this is part of the beard, and it is not permissible to shave it. However, if your parents command you to shave your beard out of fear for your safety from harm and security pursuits, and this fear is a prevalent assumption based on the reality of the country and not mere illusion, then this is considered a valid excuse for coercion to shave. In this case, there is no harm in obeying your parents, and there is no sin upon you.