I managed to do that with Google Photos, but my family isn't going to make new accounts for anything else, let alone a Facebook property.I've been on Android mostly for 10+ years, with a few unfortunate iPhone's too.
Anyways just have the iPhone users install Duo to do Facetime type chat between iOS and Android, works perfect. And What'sApp is a great full featured text app to use between iPhone and Android users.
Most my family is on iPhones and had them install those 2 apps, takes all of 30 seconds, and all set .
Apple just makes it so much safer and more secure.