Property dispute

yes, no one can deny the share of adopted child ,and as a legal heir to D ,the property will divide in four parts equally among a,b,c and adopted child.

but for division of share among a,b,c and adopted child,the adoption of child must be legally and valid by the law.

1. D's share goes to his wife. After that she is free to give it anybody she wants by a Will. She could have equally given it to a stranger. 

2. Adoption if done correctly the adoptive child loses interest in all property of his biological parents. 

3. The widow as per the HIndu Adoptions & Maintenance Act, 1956 can adopt a child to herself, she need not take consent of her deceased husband's relatives. 

Yes I also agree with Mr.Bharat opinion

dear sir, ten years ago when D's wife was alive she registered 1/4 of total property to her brother before A,B,C, D's wife dividing the property. so at that time A went to court that how can she give property with out dividing.then court given the order that first divide and then ur wish. but at this time she adopted a boy after that notice of court. now she died with out dividing .then how it will go to adopted child?

@atulasi

PLease get documentation that the child was adopted legally by d's wife. You can seek to get the legal consultations from a practicing lawyer

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Regards