How would pota's grandfather' proberty be like?

Facts posted are vague and not clear.

It is advisable to consult and engage a local prudent lawyer for professional guidance and necessary proceeding.

yes vague query .. need clarity on it

By opening too many posts with the same issue, you can not get precise guidance. Your mother appears to be the only legal heir of your maternal grandfather.  The last rites of grandmother were performed by those who are like her sons as per religious practice.  A grandchild is not a Class 1 legal heir and so husband brother's children that performed last rites, as grandparents are having a daughter, class 1 legal heir..   Contact a local advocate as he can understand exactly what is in your mind.

Yes, the posting lacks clarity.

You are repeating this question despite posting the same question in Hindi language but using English scriptt in a different thread today itself.

If you want to know more opinions to your query, you may visit that thread and peruse the opinions given by  various experts of this forum.