DEAR ABBY: My sister has always been a liar and a manipulator. She has lost jobs because of her toxic behaviour. Our parents passed away 20 years ago, and ever since, she has trashed their memory to anyone who will listen. She claims she was unwanted because she was female, that my parents refused to name her and wouldn’t take her home from the hospital until police were called. None of that is in any way true. 

Now, she’s claiming our mother slept with multiple men and my biological father could be nearly anyone. I have a DNA test that proves that my father was the man who was married to my mother for more than 50 years. She dismisses this proof as a “lab mistake” and maintains her tale about my parentage. 

How do I respond to this? Do I contact members of our large extended family and

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