Proof of funds: Joint account

[Peaceful]

Hi there,

Bank # 1: FD joint account with dad.

Bank # 2: Post ITA, planning to get a gift deed from parents for the balance as a transfer into savings account of some other bank. since #1 not sufficient.

Question:

Is it ok to use FD as proof of funds?
If yes, does it have to be for a shorter period of time?
Is it ok to use FD which is in joint account with someone who is not included in the application, ie parents?
Is it ok to have letters for POF from two different banks as above? Saving account and FD in different banks.

Thanks