The CardDav and CalDav stuff was a hassle for me to make work. After the trial and error and googling, getting it set up myself, I pretty much had to grab each

The CardDav and CalDav stuff was a hassle for me to make work. After the trial and error and googling, getting it set up myself, I pretty much had to grab each family member's mobile device or computer and punch in the magic codes. But once I had it going... It works! All of our calendar and contact data is available on each of our computers and we can share them easily. And we own the data, not Apple. I highly recommend owncloud.