Purchase of a land

Multiple issues have been clubbed togather in your post, which make it confusing.

Wife purchased land in her name and died intestate, is it so ? If so, the property shall devolve upon her daughters and husband in succession, presuming the family professes Hinduism.

Subsequently husband died executing a will (of his share in the property acquired in succession)., is it so ? If so, his share shall devolve equally amongst both the daughters as per testamentary document (Will of their father).

At this stage  you have stated that both sisters executed some "Consent Deed" by elder sister to younger and vice-versa, what is there in the document, is vague and not clear. 

Some more similar confusing circumstances have been mentioned in your post, be clear and repost.

Later on you have mentioned that 

Well explined  by respected senior expert advocate Dr. Vashishta Sir. I endorse his view and opinions.

My question is that what is the consent deed exeuted within each other by the two sisters.  Without knowing the details of the consent deed, any opinion rendered in this regard would be a misguidance.

As far a the the question about claiming inheritance rights by the thid generation children is concerned, nobody have any rights to claim any share when both the sisters are alive neither any one of them can claim any share in it as a right for the property sold directly by both the shareholders jointly during their lifetime. even after their lifetime.