President Ford bio from the Ford Presidential Library and Museum

Here's President Ford's bio from his presidential foundation:

Gerald Rudolph Ford, the 38th President of the United States, was born Leslie Lynch King, Jr., the son of Leslie Lynch King and Dorothy Ayer Gardner King, on July 14, 1913, in Omaha, Nebraska. His parents separated two weeks after his birth and his mother took him to Grand Rapids, Michigan to live with her parents.
On February 1, 1916, approximately two years after her divorce was final, Dorothy King married Gerald R. Ford, a Grand Rapids paint salesman. The Fords began calling her son Gerald R. Ford, Jr., although his name was not legally changed until December 3, 1935. He had known since he was thirteen years old that Gerald Ford, Sr., was not his biological father, but it was not until 1930 when Leslie King made an unexpected stop in Grand Rapids that he had a chance meeting with this biological father. The future president grew up in a close-knit family which included three younger half-brothers, Thomas, Richard, and James.

The rest of the bio can be found here.