Our expert says:
Am I understanding correctly that they live in YOUR house ? that is, that the house belongs to you, rather than that you all happen to live together in the family home ?
Your mom and sister probably bicker because they both feel trapped in the same home, lacking alternatives.
A counsellor would be useful, but I understand might not be available where they live - is there some senior and respected person in the family they would listen to, who could help ? They need to be told that their constant bickering annoys and hurts everyone, and does them no good. If it is your house, and/or if you are paying the expenses, then you have a basis for being more stern and making it clear that the house rules do NOT allow this useless quarrelling.
They sound un der-employed, too - can't your sister get a job ? Or if she works, get more work, and work towards getting promotion ? What about your mom ? Can she get a job, too ? They need to have other things to occupy them than just annopying each other.
It must, yes, be irritating to hear your mom going on about missing parents who treated her badly - maybe this reflects how she may feel EVEN LESS cared for now ?
Talk to them calmly but frankly about how bad they make you feel, always putting you in the middle of their quarrels, and ask THEM to suggest ways in which they could improve the situation
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