As per your submission it reveals that this is a matter of sos son and son wife right in the property
If property is coparcenary ancestral property then sons son can claim property through her mother as guardian
Sons wife after marriage has no right to claim
After remmariage, wife cannot claim your property. But your grandson can claim property and too only if you permit him. Otherwise it is completely your will to whom you want to give that property. For any further information, feel free to contact me on my e-mail "firstname.lastname@example.org"
Shubham Pabbi & Associates