HI! It might be that you're in a different Realm than your children. Be sure to read this page from the Player's Guide on how to change realms. Also, you may want to add your children as friends through the use of a True Friend Code. Once you're friends with them, you'll be able to "teleport" to them through your friends list.
If they still aren't showing up for you, the fine folks at email@example.com might have even more suggestions.
Step 1: Select the Gear icon in the top menu of Pirate101. Step 2: Select the Realms tab (it looks like an icon of Earth with a bidirectional arrow above it) Step 3: Select the Realm you want to go to from the list of available Realms. Step 4: Click the Go to Realm button.