How can i block all of my activity from a facebook friend?

[Az]

I have family members on facebook and If i delete them they would get mad at me.
How can i block EVERYTHING from them, I know i can block shares photo albums and posts, but how can I block comments too like if i comment on a status picture or group in won't appear in the bar on the right or anywhere like i never commented(unless they find the status which can't happen) or if i like a picture they won't see that I liked it(unless they find the picture and see) pretty much like i unfriended them but we still are friends

[abraXus]

add them to your restricted list

[JackCola.org]

Two options:

1) Add them to the restricted list

2) Block them entirely on Facebook or unfriend them

By blocking, it will be like you don't exist on Facebook to them.