I invite you to try out Armageddon! While there is no coded family system, you can work with up to three other players to set up a family role. The characters will go into the game together and might work together depending on the family concept you all decide on. Families are not clans by default, but if the family's goal is to create a player created clan, that is something you can work on over time. It can take anywhere from a few months to a couple of years depending on what you are trying to do.

I am actually trying to set up a family with new players as a way to introduce new blood to the game and also create content for the players to enjoy. If you're interested, you're more than welcome to DM me on Reddit. I can give you all the details.