Hi Magpie and Amethyst,
I am sorry to read your posts and see how difficult you are finding coping with both of your sister’s addictions, especially how it impacts on their children.
Perhaps you would like to contact us at The Icarus Trust. We are a charity that supports people dealing with the affect of a loved one’s addiction. We have experienced, trained people that you could talk to and they may be able to help.
You can contact us on help@icarustrust.org or visit the website http://www.icarustrust.org
I hope that this helps. All the best to you both.