Passing parent child relation object to WCF service with entity framework

Hi, I making my first WCF service so I have few questions in mind. I would be using Entity Framework for database operations so the entities generated by EF would be used on the Services end. 
    My question is that should I create a wrapper class on both Client and Service side and unwrap them after transferring or I should use same classes generated by the Entity Framework on the Client side. Creating wrapper classes would increase the amount of code I have to write while using entities generated by EF could result in unnecessary data being transferred over network.