As mentioned by Ashish, those are the documents required for PF/Pension withdrawal.
Bank Document Requirements
For your first question, as he doesn't have a passbook, a canceled check or any other valid bank document that includes the bank address and account details will work.
Eligibility for Pension Claim
For the second question, no one is eligible to claim a pension if they have worked less than 6 months (as pension calculations round off months to zero for less than 6 months and one year for more than 6 months). However, in the case of full disablement/death, there are chances that he/nominee can avail of the pension. Please correct me if I am wrong! (I believe he can claim PF using Form 19 but not Pension using Form 10c).
Thank you.