Shortly after you begin the game, Robin will offer to build up to 3 cabins on your farm. Each cabin will house a farmhand, controlled by one of your friends.
Farmhands can do almost anything the main player can do. They can farm, mine, fight, fish, forage, marry NPCs and take part in festivals. Each player has their own inventory. When a farmhand is not connected, their inventory can be managed through a chest in their cabin.
It looks like marriage will remain a feature in multiplayer, along with already existing events and festivals.
A beta test is expected at the end of the year- with the official patch being slated for early 2018.
I feel the mountains burn inside 