I suspect it all depends on exactly when the first wife died, when he retired, when he re-married and if he informed the RAF of the marriages. I think the pension scheme will be very similar to the Civil Service scheme, which does pay a widow on a pensioners death with caveats. eg, if the widow re-marries or even cohabits the pension will cease. If he was a widower at the time of his retirement he might have got a pension refund because there would not be a widow to claim a pension on his death. I also seem to remember having to declare who my widow might be so, if he didn't change that information, there might not be anyone listed as his widow.