On August 4th, 1980, Sharon Black’s muggle home was attacked by Death Eaters (including former Professor Severus Snape-more on that later).  While brave Sharon was taunting her torturers in the main part of the house, her love was smuggling their newborn son and an unknown number of muggleborns out the back.  The muggleborns were sent to France and Sirius Hadrian Black was transported to the Potters via Sirius Orion Black, his uncle. 