I don't know what is the best digital family calendar but you should consider getting one
I bought a hearth display because I wanted a better family calendar. That was the whole brief. We had google calendar, a whiteboard, a paper wall calendar, and none of them were working as a shared system. I wanted one thing on the wall that everyone could see and I could stop being the person who held all the information.
Six months in the calendar is fine. It does the job. But it's not what I think about when someone asks me if it was worth it.
What I think about is that my 6 year old now has a feelings check in every morning that she takes genuinely seriously. She picks her mood, sometimes she wants to talk about it, sometimes she doesn't, but there's this small moment of self awareness built into her day that didn't exist before. My husband started noticing it too and now we have more context for how she's doing on any given day rather than finding out at 8pm when something finally boils over.
I didn't buy it for that, tbh I didn't even know about this option when I got it. I was comparing sync compatibility and screen sizes and I skimmed over that feature when I was evaluating options.
I don't know if that makes it the best digital family calendar or not. I just know it's the thing I'd miss most if we took it down.