One way you can make things easier is by establishing open, good and solid communication with all the members of your family. This is the most important thing. This way you can explain the situation to them properly, and discuss any issues (and believe us, there are sure to be a lot of these) that any family member might have regarding the move.

Another way is give everyone early notice. This gives more time for everyone to resolve any issues they might have. This will also give you more time to prepare the logistics and arrange for the movers, etc.

Get everyone involved. When you're talking to the kids, try to get them involved in the moving process. After all, they'll be moving their things as well. It will teach them to be responsible for their own things and also show that you respect their privacy, since you're letting them fix their own stuff instead of poking around their things. But also show that you'll be available should they need any help.

Emphasize the good things. Always try to (subtly) impress on your kids not just how important the move is, but also about the advantages attached to it – especially the advantages to your children. After all, you won't be moving if the reason weren't worth it. Also try to exercise more patience with your kids. Understand that they're going through a difficult phase in life they have no control over, and they need your support.

Speaking of support, always be open to your children's suggestions, if they have any. Establishing good communication means that you're ready to listen to them and their concerns, as well as take both positive AND negative comments. Be sure to also do your best to answer any questions or concerns they have regarding the move. This will show that you also consider what they think and feel as valid concerns that also need to be addressed.

After the move, some children will exhibit signs that they are experiencing difficulties. It will be easier for you if your children were the type to come up to you and tell you directly that they have a problem, but for a lot of other kids, displeasure, and sometimes mental strain caused by the move manifest in more subtler symptoms like loss of appetite, difficulty sleeping, and anti-social and / or aggressive attitude and behavior. So you need to look out for signs like these, and consider the possibility of going to family counseling in extreme cases. Some children exhibit these symptoms especially if the move is done after a tragic or traumatic event, so it's always important to look out for them and try to let them know that you will always be there to support them and help them.