You can't. Verizon has set up the service so that the phone you are trying to locate gets a text message every time you send out a request to locate it (update location for that phone). They also text that phone if you set any limits for that phone or if you flag a number so you can be notified if they call or receive a call from that number. Family Base is only useful if you tell your kids (or whoever) up front what you are monitoring, why you want to be able to locate their phone or know who they are receiving calls from. Otherwise plan on your kids - whoever - being notified of everything you try to do.