Hello dear sumi,
You are South African? It seems strange you would get a funny attitude from people,
but I have no experience living in South Africa.
I hope you are able to improve your living conditions for your family.
I am a recovering alcoholic, and I can tell you that trying to be reasonable with your MIL will not work.
If she is drinking and taking pills, she is not thinking clearly at all. Anything that she sees as a threat to her addiction
will be dealt with harshly. If she has been doing this for many years, I can understand why your DH finds it hard to leave.
This might sound off the wall, but (i think) both of you could benefit from reading about being codependent.
Look up some forums maybe, and do some reading.
When both of you can give up your expectations of your MIL becoming a kind, understanding, and compassionate person,
then you can use your energy to get away.
I am praying for better days for you.
Beth