how can i find my families iphones

Hi,

We are an apple family. We have several iphones and ipad's and mac's. I have a main appleid that i use for purchases on the app store and my wife has a seperate appleid for her itunes purchases. The problem i have is i want to be able to find any of the iphones or ipads. but they are not all under the same appleid from the point of view of icloud.

Is there a way I can use this facility even though I may want my family to have there seperate icloud accounts for address, mail, etc..

Thanks.