Clarification over share in ancestral property

we are sikh,s bhabhi has made the gpa nottary attested in favour of my nanaji and nani and on the witness column two witness are there, but one we dont identify and the another is very innocent person who was the land lord of my nanaji ,but a criminal fir has beed logged us 420/468/467/471/34 by our nanaji nephew , documents sent to fsl reports comes in favour of negative that sigh does not match in papars now my nanaji has expired and nanaji bhabhi has expired but she give the posession to my nanaji when she was alive now pressure comes to the witness and police said that the charge sheet will be imposed against them what does witness role in this matter , the party who gpa to the other party was died 5years ago only my nani ji alive so why there witness has been harassed please suggest us what do i do for our witness