Face time with android

You can use FaceTime on the iPad yes. The Android Phone has. nothing to do with it.

You can also join a FaceTime Call from an Android device now, the iPad would not have anything to do with that unless it was the one initiating the FaceTime Call. See here: link-> Join a FaceTime call from an Android or Windows device - Apple Support

FaceTime from the iPad to another Apple device, yes.

If you’re thinking about text messages and SMS messages from the iPad, no. That requires Continuity, and an iPhone.

If you’re thinking FaceTime from iPad to an Android device, no.