What do parents have to know about the shunt placed on their child for hydrocephalus?

As much as possible. Much of the information can be obtained from the neurosurgeon that placed the shunt. It is good to keep a record with you because people move/travel. Some of the basic information you should have includes: reason for the shunt, type of shunt (including model/ company brand), where does the shunt go (ie. Brain to abdomen vs. To pleura), is the shunt MRI safe? A copy of a baseline ct scan is useful.
Hydrocephalus. Every patient has different circumstances. The parents need to meet regularly with the care givers and ask questions until they fully understand what they can do to help their child. Ask lots of questions. Make a list of questions and take it with you when you meet with your child's physician and care givers.