When I left my active AH, I left to take better care of myself and my children. I told my sister my reasons and a few close friends. (my parents are deceased)
I did not tell my in-laws. I did not share with them prior to my leaving about the addiction, the financial disasters, the physical illness, the anger, or the disrespect. I did not feel it was right to share all this with them when I left.
I gave them (through my X) my new address and phone number so that they could stay in touch with their grand daughter. They have arranged a visit with their grand daughter since our divorce.
My X kept a lot of things secret from his parents. He did not have an open, honest relationship with them for the 16 years that I knew him, therefore, I did not believe it was my place to enlighten them.
As I learned in my recovery, what other people think of me (and my reasons for divorcing) are none of my business. I know why and that's enough for me.