Family Issues Support Group
Family issues is a huge range that go from minor conflict to major misbehaviour and even abuse on the part of individual members of the family occur. Whether you feel you are in a dysfunctional family or you're dealing with a very specific issue, this is the place to talk about it and find others who might be going through the same thing.

Did you ask her about it?
PEACE, (Parents of Estranged Adult Children Everywhere) and
PWWA, (Parents Who Walk Away), this site is more for parents who have been going through estrangement for quite some time but they're still very sympathetic and support to folks that are new to this.
It's doubly tough when there are grandchildren involved. I'm so sorry for your pain.