If Jet Airways really wants to offer something like this then why make it so complicated, verification calls, faxing documents blah blah plus they will deduct 1000 miles per member you add. They are just short of asking DNA testing!
Why not do something like BA's Household account, you can add anyone, just an email validation needed.
Guess Jet realised with the new redemption structure the entire family will have to pool in to redeem just one ticket