Send it!! - I think it's an excellent reply. I especially like the part about you not picking who he can or cannot be friends with and he shouldn't pick who you can or cannot be friends with either.
I also maintain a relationship with my STBX-in laws. They like me and I like them. When I am with them or talking to them we do not talk about or focus on my STBXW. I see nothing wrong with it at all.
