If your relative had worked for more than 10 years in any one Company already they might have given him the Pension certificate at the time of separation.
Secondly try to get the EPF number of other company also through payslip or you may check with the respective HR. First old EPF account to be transferred to new one and then can claim as one PF.
IF UAN number is already provided by the last employer then you can transfer the old pf to new account through UAN login itself.
Pension process will be separate through PF office.
4th June 2019 From India, Madras