Well im in the middle of gaining a new fantastic co so im pretty happy
however it is more like a marriage thing rather than family, due to the fact the owner of the account asks the player to Co (like proposing to the love of your life)
then if they say yes you go have a fantastic wedding (merging accounts etc... etc..) but if they say no you go cry in a corner for a few hours and keep looking, 'plenty of fish in the sea'
also you guys will form the closest trust/bond in the game, share the best jokes and the worse ask one and other silly questions and take out anyone looking up your Co in the wrong way
anyway, goodluck to all you solo players and to you co-played account users in W57.