If you happen to play a cool game on Steam, chances are that your friend or sibling will request you to allow him to play the game. You can simply make use of the Steam Family Library Sharing feature and share various games on Steam with them.
Let me simplify it more for our not-so-tech-savvy friends. With the feature I mentioned above, your friends can have access to your Stream Library and can play the same games in your library from their devices.
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How to Share Games on Steam With Your Friends
Your friend or your sibling won’t have to spend money separately buying the same game that you have. The family library sharing feature will make it easier for them to play several games without having to pay for that.
There is a caveat though. If you are playing the specific game at the current point in time, your friend can’t access the game. He can only get to play through family sharing only after you (the original buyer/owner of the Game) finish playing.