17. In 1969, Franco declared that his successor as leader of Spain would be Juan Carlos, grandson of the deposed Alfonso XIII. Why did Franco not instead choose Juan, Count of Barcelona, father of Juan Carlos and son of Alfonso XIII?
From Quiz Still Dead
Answer:
He did not particularly like him
Juan lived until 1993 and did not formally renounce his right to the throne, two years after Juan Carlos became King. The simple answer is that Franco and Juan did not like each other. Juan referred to Franco at least once as an "illegitimate usurper", and often pressed Franco to restore the Spanish monarchy. Franco, for his part, was concerned that Juan would undo many of the changes that Franco had made and restore democracy to Spain.
Franco felt that Juan Carlos would support and maintain Spain as Franco had shaped it. When Franco died in November 1975, Juan Carlos was proclaimed king. King Juan Carlos, to the surprise of many, strongly supported the idea of constitutional monarchy and establishing Spain as a democracy--exactly what Franco thought Juan would do.