Blocking people on facebook?

So, I have a question about blocking people on facebook.
My boyfriend is friends with my mom's ex husband on facebook. We're in the middle of a legal dispute with him. Me and my boyfriend have been talking about updating our relationship status on fb. I don't want my mom's ex husband to see that I'm dating this guy. If I block him, will he be able to see the update? I don't want to ask my boyfriend to block him 'cause I don't think I have the right to interfere with whom he's friends on Facebook.
Blocking people on facebook?
Add Opinion