Would you delete a friend on facebook just because someone wrote you a message?

[BRi]

My sister in law wrote me a email on facebook because she saw that i was friends with my brother's ex from high school. So my real qustion is just to delete the ex girlfriend so it dosen't cause trouble

[Kristy]

Was your sister angry? Are you good friends with this girl? Do you want to continue talking to this girl?
You'd cause trouble with the girl if you just deleted her without telling her why.
I'd talk to your sister and brother and ask if it bothers them that you are friends with her.
But if you just added her and she isn't really a close friend, I'd just delete her. But give her a reason or something.

[M Anthony]

well, really, your sister in law is allot insecure. But... this Ex girl friend won't even know you deleted her unless you looks for you for some reason.

Delete them both!