Hi Macca, my two sons were conceived using a known donor. They have also been told the truth that a nice man helped their mummies have them by giving us his sperm etc (at an age appropriate level). The donor lives interstate and as such was not part of our daily lives. When my eldest was about four or five he wanted to know more about the "nice man". We told him his name, they spoke on the phone and then visited in person (there had been previous visits but without it being made explicit that he was the donor). The donor sees the boys once or twice a year when we are in the same state. Like Alisia I cannot imagine why an employer would ever need a birth cert. I guess if there was some reason, then in the case of my children they would just explain that they have two mums but only one is on the birth certificate because of the silly Australian laws at the time!