Steam Families is live, and you can all play at the same time
Briefly

Steam Families introduces a new family sharing feature, allowing up to five members to access a shared library, play simultaneously, and manage game access.
The new family feature enables multiple users within a group to game on titles from the shared library at the same time, enhancing communal gameplay.
Steam Families incorporates parental controls allowing adults to monitor their children's access to content, impose playtime limits, and oversee game purchasing.
Restrictions exist for Steam Families, including geographic limitations and a year-long waiting period for adults wishing to rejoin another family group.
Read at Engadget
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