About twice a year we see my husbands sister and her husband. What happens is I get left with her and my husband finds 'manly' things to do with her husband. This would be OK if I found her company remotely agreeable but I don't. She is a stream of consciousness talker and a major hypochondriac. She talks over me continually and if she wasn't my husbands sister I would have no problem in just telling her to STFU, but I am hamstrung by family duty. I find her company so difficult I stop sleeping properly when she is in the house. I am sure she means well but I have endured 3 hours of her tedious boiler story and now she has underfloor heating issues I have completely lost the will to live. I have told husband that if he leaves me alone to deal with her again I will divorce him but I know that it will just repeat itself. How do I get her to shut up without killing her? Am I being unreasonable feeling this way?