Indemnity Bond Before death First Holder of the Flat had already Nominated 4…

Indemnity Bond
Before death First Holder of the Flat had already Nominated 4 Nominees by submitting Form No. 14 for Nomination.
1. Now,after his death, do the nominees required to file ”Indemnity Bond” to claim deceased person’s share in the Flat property ?
2. From where to get the said ”Indemnity Bond” ?
3. Do the same reqd. to be notarised or submitted on stamp paper ? If yes of what amt.of stamp. ?