Facetime alternate between ipad/iphone and samsung galaxy s3?

I got a ipad and my parents who stay somewhere else earlier had an iphone and we used to videocall each other through facetime for free on Wi-Fi. But now they have bought a galaxy s3, so they dnt have any facetime now. Can anyone tell that how to video call over Wi-Fi between ipad/iphone and galaxy s3

Skype

Oovoo, skype and other video chating app for both android and apple

Facetime doesn't work on galaxy s3, so you should use tango app.

It is really a trouble to you, but you can solve it by using some related apps like iPad/iPhone apps. Many apps is good to use. You can search in some website. Such as

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