David Livingstone had two sons Robert and Thomas. See more information on David Livingstone at http://www.victoriafalls-guide.net/david-livingstone.html
Three sons and three daughters.
He had six children: Robert reportedly died in the American Civil War; Agnes, Thomas, Elizabeth (who died two months after her birth), William (nicknamed Zouga for the river along which he was born)...
no, he had three sons and two daughters
The exact number is not known as he had many wives.
There were at least 20, but there probably were more because the children of concubines were not recorded.