No matter what your family is like, they'll probably go through a difficult period after any long distance moving. Besides the loss of friends and the transition to a new part of the country, children of any age might simply not know how to react to their new lives. You should make sure to make an effort to get them used to a new house and community after the relocation and moving services have brought all your possessions.
Establish family routines as quickly as possible, especially those that can be carried over from an old home. For example, if dinner was always served promptly at 6 p.m., continue to adhere to that schedule as much as possible. It will establish continuity between the two places and subconsciously helps children become comfortable with their new lives.
Unpack as soon as you can. One of the hardest parts about being in a new place is the alienated feel it can have. When the furniture, decorations and possessions that were in a previous home are everywhere in a new house, it makes it a lot more comfortable and a lot less unfamiliar.
Explore the area whenever you have free time. The more your family knows about their new town or neighborhood, the faster they'll come to think of it as home. It's also a great way to meet new people, which certainly eases the burden of being uprooted and moved far away.