Q: Multiple Family Calendars

I created a Family Calendar some years ago that I shared with my wife and kids.  A few years ago, Apple introduced a calendar called "Family", so I was used to seeing two Family Calendars both on my phone and on my MBP.  Now I have four calendars all called Family.  What's going on?  How can I get back to just one calendar called Family (probably just using the default Apple Family Calendar)?