To facebook privacy experts - how do I prevent my husband's ex-girlfriend from getting information about us?

[noseyparker4]

My husband's ex-girlfriend is on his sister-in-law's facebook, who is also on my friend list. My husband's ex is not on my friend list but somehow has been getting information about our marriage and the birth of our child (we found this out through a friend in common). I have my privacy settings set to "friends only" so I am not sure how she found out this info. I am thinking that maybe when my husband's sis-in-law comments on our updates, maybe my husband's ex can see those comments and in turn our original update - is this possible? If so, how can I prevent her from seeeing our updates in this way?

[JOHN C]

By not posting personal information to the web anywhere!

[ican.]

block them

[Gilbert]

Limit ur conversations to ur sister in law,It sounds like she is the cause of this problem.

[Tsukasa Amoe]

actually i agree with your sister.

shes just looking out for you.

and i know you're gonna show her those answers and say "i told you so"

but in general its for a high school -- college base kinda thing

and im sure your not 13 in the high school

just wait a couple years/months and you can have it

its nothing big anyways

and it asks for your b-day and thats how they determine if you're allowed to go on, and yes you can lie about it, but thats not the best idea........