Everynight when it is time for my daughter to go to bed, I tell Honey and Lilly (wherever they are) that it is "time to go to bed" or "Helen is going to bed now". They usually beat my daughter to bed and don't get up again until the next morning.
I can also ask them to "go find Helen" and they usually can go straight to wherever she is. Or if I say "Helen's on the phone", Honey runs to me so she can listen to Helen's voice.
I guess you can tell that the word "Helen" packs a pretty powerful punch in this house!