Sati was an incarnation of Mother Goddess Shakti. Who is the
father of Sati? On earth, Daksha Prajapati was the father of Sati. Daksha did
not like Shiva as he considered Mahadeva far removed from reality and led a
life outside the society. But Sati loved Shiva. She married Shiva in spite of
the objections of Daksha. But Daksha insulted Shiva and once performed a yajna without inviting Shiva. Sati who wanted to know the reason for Shiva not being invited was insulted by Daskha. She then committed self immolation. (More on this story can be read here.)