Whatsapp ,Skype, Telegram, Google Duo, etc apps work fine on Android phones which are lots less expensive than Apple Devices that are needed for Facetime
Trust me, you don't want to put family on Android. My mother started out with Android (to save money), and she never even fully understood how the bottom buttons worked. I became the customer care. Now she's on iPhone and there's no support burden. Phew.
You don’t usually get to choose what devices people buy. All my family is on Android simply because they’re not interested enough in tech to spend triple the price on an Apple device, and there’s nothing I can say to make them spend that much.