I would second all that Cas said but would add that for the father to be named on the birth cert that he was present at the registration. For an unmarried person then as is now for a father to be named he as to specifically state he is the father of the child. From that I would suggest that they may have been living together but were unmarried. It is then possible that he died or moved on at a later period.The term iligitimate means that the mother was unmarried at the time of birth and not that the father was not known.Rob