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hayatahmedallah well, it's alike just because the heroine marries the younger brother of a deceased husband? What are the other clearly copied elements? I wouldn't say as much because it was hard for me even go past the third chapter, to know (comparing with the summary of Kumkum- ek pyara sa bandhan in Wikipedia I didn't find alike). Absolutely not my cup of tea.
Did both works start alike? Is the family's dynamic identical? Is there some specific scene that is identical in both works? Those could help to identify plagiarism.
I'm not doubting what you say, first because you watched the show and read the book, and I didn't.
But it's not so easy to proof plagiarism, even in the court, and it's one of the reasons the author must file a complaint about it if they believe their copyrights are being infringed.