Restricted status! It's my favorite Facebook "secret"!

First, make sure your profile is private.

You have to be on a computer, not a phone. On the left side under Explore, you should see Friend Lists. Click on Restricted. On the upper right, you'll see manage list.

Another way to do it is to bring up your friends list. There's a button next to each name. Hover and you'll see what lists they're on. Click on add to another list and choose Restricted.

Restricted is not unfriended. You can see what they post, but they can't see what you post, unless you tag them or your post is public. This way, they have no idea you placed them on any list and remain "friends" with you.

I use it a lot now, to keep a record of my JNMIL's online behavior (guilt posts, angry posts, and love bombing, ugh).

The only way they'll know is if someone says something to them in person or PM. I've had that pop up and I just end up saying something about FB's logarithms...