Any good Skype alternatives for family?

Now that Skype will shut down, i see a good chance to geht my family to switch to a better solution. In order to even have the chance to be accepted instead of just switching to teams i think it has to check the following goals:

• easy to use
• reliable
• direkt calling (called device will just ring)
• multi paltform (iOS, Android, iPad, Windws)
• group calls
• free to use (unfortunately)

I tried:

• Jami: unfortunatly was unreliable in my first two device test
• Jisti Meet: no direct calling
• Signal (already failed to convince all family members a view years back switching from Whatsapp, mabye this can be an new chance. But Videocalling infortunately is too often unreliable)