From the past and from experience with friends, relatives and others the mother often feels it is nobodies business who the father is even when a son or daughter asks their mother it is not uncommon to be told it is none of their business.
So imagine how they would react to putting it down on paper.
Perhaps in some cases it is loyalty,not wanting to get someone into trouble or have to pay maintenance, sometimes the father never even knows.
Its all a bit strange really.
