Can I share one PlayStation+ account between two PS4's?

I just bought a second PS4. I have one in the living room and one in my game room. My son uses the one in the game room. I only have 1 PlayStation Plus account. If I make the new PlayStation my primary PlayStation, how can my son use the one in the game room to play all the free PlayStation plus games?
Best Answer
According to the PlayStation FAQ:
You can only activate one PS4™ as your ‘Primary PS4’.
Your primary PS4 has unrestricted access to all content on all accounts. But a non-primary PS4 can only access the content while logged in.
Here's what you can do: set up your son's PS4 as your primary PS4. That way, he will be able to use the Plus features while logged on his account. The downside is that on your PS4, you have to log into your PSN account to do anything, that means you'll be blocked if the Internet is out.
This is entirely different on the PS3, as it allows you to activate two unrestricted consoles.
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Can you share a PSN Plus membership on two consoles?
Can I share PlayStation Plus with a friend on another console? No. You can only share your games and PlayStation Plus benefits with accounts on one PS5 console with Console Sharing and Offline Play activated and your primary PS4 console.Can two people play on the same account on different consoles?
Only one of the consoles can act as the primary console. On the primary console, any other users can play the games you downloaded with your Nintendo Account. On non-primary consoles, only your Nintendo Account can access these games.How do I share my PlayStation Plus with another PS4 2021?
Each player can have one PS4 console activated as the primary PS4 console for their account. Go to Settings > Account Management > Activate as Your Primary PlayStation 4.How To Share PS Plus Account | UPDATE 2021 (PS4/PS5)
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Answer 2
I haven't actually tried it but I believe it works like this.
If your account is registered on both systems, all other accounts on those systems will be able to play PSN games (with their own save files ofcourse). You need to purchase the game on the ps store (for free if it comes with ps+) using your account. Then it can be played using any account on the same system.
Check the comments for more details. Apparently this only works when online. (Thanks Dupree3!)
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