One of the first rules of a happy, stress-free life is to stop trying to change things that are out of your control. At present your problem is driving you into a never-ending spiral.
Your fiancé’s mother and sister are behaving badly...and that creates problems between them and your family...and that in turn impacts on your relationship with your fiancé...which in turn threatens your mental health. Can you see that in your assessment of the situation you leave no room for anything other than you stepping out of the loop by stepping out of their lives?
However, there is another option. When you can’t change the stimulus you put all your effort into changing your response. This is something you do have power over, however difficult it might seem, so I would see your solution needs to be built around firming up your own confidence and emotional state. Stop allowing other people to control that. You’re worried about their behaviour impacting on your mental health but many people manage to live with difficult in-laws and muddle through without it causing mental health problems.
I speak to so many brides who face their wedding day with a ‘grit your teeth and smile’ attitude to their new in-laws!
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