Since this is a viral infection rather than a bacterial one, once your kids have it you can mostly only treat the symptoms. See your doctor and ask if they can prescribe anything to lessen the itching and general misery for your child. Antihistamines can often help, although you should discuss their use with your physician. If your child is considered at high risk, your doctor may prescribe an antiviral drug such as Acydovir. Never give a child with chickenpox aspirin, as this can in rare cases lead to Reye’s Syndrome, which can be fatal.
You can also provide some relief through old-fashioned remedies such as a cool bath with either baking soda or uncooked oatmeal, or by rubbing calamine lotion on the sores. Keep your child from scratching as much as possible, as this will only prolong the agony. If it helps, trim their fingernails or put gloves on their hands at night.
The most important thing is to keep your kids in isolation until all rash form Scabs which usually takes about 1 week. During this period and until all of the lesions crust over, they will be incredibly contagious and likely to spread the disease to anyone nearby who hasn’t been vaccinated or already infected. Be especially sure to keep your children away from anyone younger than six months old, elderly, pregnant or with an immunodeficiency disorder, as chickenpox can cause dangerous complications in some rare cases.