how many kids did they have?
Four children
Martin Luther King Jr.
 They became the parents of four children: Yolanda King (1955–2007), Martin Luther King III (b. 1957), Dexter Scott King (b. 1961), and Bernice King (b. 1963). 
when was martin luther king jr. born? January 15, 1929 who were his parents? Reverend Michael King Sr. and Alberta King was he married? Coretta Scott do you know where they got married? Heiberger, Alabama
wiki:25700329
Martin Luther King Jr. [SEP] Marriage and family
After the second date, King was certain Scott possessed the qualities he sought in a wife. She had been an activist at Antioch in undergrad, where Carol and Rod Serling were schoolmates. King married Coretta Scott on June 18, 1953, on the lawn of her parents' house in her hometown of Heiberger, Alabama. They became the parents of four children: Yolanda King (1955–2007), Martin Luther King III (b. 1957), Dexter Scott King (b. 1961), and Bernice King (b. 1963). During their marriage, King limited Coretta's role in the civil rights movement, expecting her to be a housewife and mother.