If I post on Facebook, and exclude someone, can they see the responses?

[madjazz]

Here's an example: I have 500 friends and want to post something but exclude a few family members from seeing the post.
Facebook allows you to block people so they won't see the post, but if a thread is started, and I respond, will they see the thread then?
Will they automatically be blocked from the thread, or will I need to continue to exclude them from each response..?
"How could they comment on your post when they're blocked?"

Let me clarify: I write a post that says "I am eloping with my girlfriend"...but don't want Aunt Sue or Mom to see it.
Of course a post like that will promote discussion from my other FB friends, so when I reply to ANY of the other 498 friends within the thread, will the two excluded people THEN suddenly see the post or will they be excluded from that entire post?

[Madis]

How could they comment on your post when they're blocked?
You don't have to do anything after you've blocked them - they won't see, get notifications, be able to comment or like it.

[Cheyenne]

They will not be able to see the post nor will it show up on their news feed when a mutual friend comments on it.