There is a product, called Joan Home that is meant for home use and can display a single Google calendar https://getjoan.com/shop/joan-home/. If you share the calendar, it can be perfect to show family events.

Disclaimer: I work for the company that develops the Joan product and the e-ink display, mentioned in the article.

I built one using an old, cheap eReader. https://shkspr.mobi/blog/2020/02/turn-an-old-ereader-into-an...

This is probably the easiest one to get started with https://www.crowdsupply.com/e-radionica/inkplate-6

Its old kindle screens reverse engineered and stuck on a dev board containing an esp wifi chip.

Visionect place & play is great if you can swing the price.