You’re buying a house with home security devices
A new home may come with a home security system. All the devices work, are installed in the correct places, and are ready to go. In this instance, just turn on the phone to call and set up a new service contract. A Vivint professional will still come out to make sure there are no integration problems, and they might offer options on an upgrade or two. It's a quick trip, and you can have your 24/7 monitoring set up without paying for any new components -- unless you add on.
The previous owners can move an existing Vivint contract to your family for a one-time transfer fee to make the process easier. If the previous owners are downsizing to an apartment or retirement community, transferring the security service might be a condition of the sale.
You need to move and bring your home security equipment with you
You may want to bring your favorite smart devices with you to your new place when you move. It should be pretty simple to transfer, as many components are wireless. You can uninstall each device yourself or contact a professional expert to take down the system. Then a pro will set up the same features -- and any smart items you want to add -- in your new home. Your home security contract will remain the same.